Add support for prettier as a JSON Formatter

.automation/test/json_prettier/json_bad_1.json

@@ -0,0 +1,8 @@
+{
+  "array": [
+    "one_item"
+  ],
+  "object": {
+    "first-item": 0, "second-item": 1
+  }
+}

.automation/test/json_prettier/json_good_1.json

@@ -0,0 +1,7 @@
+{
+  "array": ["one_item"],
+  "object": {
+    "first-item": 0,
+    "second-item": 1
+  }
+}

README.md

@@ -22,7 +22,7 @@
 [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Check+Mega-Linter+to+say+goodbye+to+dirty+code+in+your+projects+%3A%29+100%25+free+and+open+source+for+all+uses&url=https://nvuillam.github.io/mega-linter/&via=NicolasVuillamy&hashtags=linters,code,quality,ci,python,java,golang,c,dotnet,kotlin,rust,scala,salesforce,terraform)
 
 <!-- welcome-phrase-start -->
-Mega-Linter is an **100% Open-Source tool for CI/CD workflows** that **analyzes consistency and quality** of [**43** languages](#languages), [**21** formats](#formats), [**16** tooling formats](#tooling-formats) , [**abusive copy-pastes**](#other) and [**spelling mistakes**](#other) in your repository sources, generates [**various reports**](#reporters), and can even [apply **formatting** and **auto-fixes**](#apply-fixes), to **ensure all your projects sources are clean**, whatever IDE/toolbox are used by their developers.
+Mega-Linter is an **100% Open-Source tool for CI/CD workflows** that **analyzes consistency and quality** of [**43** languages](#languages), [**22** formats](#formats), [**16** tooling formats](#tooling-formats) , [**abusive copy-pastes**](#other) and [**spelling mistakes**](#other) in your repository sources, generates [**various reports**](#reporters), and can even [apply **formatting** and **auto-fixes**](#apply-fixes), to **ensure all your projects sources are clean**, whatever IDE/toolbox are used by their developers.
 
 Ready to use [out of the box](#installation) as a **GitHub Action** or **any CI system**, [**highly configurable**](#configuration) and **free for all uses**
 
@@ -174,6 +174,7 @@ All linters are integrated in the [Mega-Linter docker image](https://hub.docker.
 | <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/icons/json.ico" alt="" height="32px" class="megalinter-icon"></a> <!-- linter-icon -->     | [**JSON**](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json.md#readme)         | [jsonlint](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_jsonlint.md#readme)                                     | [JSON_JSONLINT](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_jsonlint.md#readme)                                         |                    |
 | <!-- --> <!-- linter-icon -->                                                                                                                                       |                                                                                                         | [eslint-plugin-jsonc](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_eslint_plugin_jsonc.md#readme)               | [JSON_ESLINT_PLUGIN_JSONC](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_eslint_plugin_jsonc.md#readme)                   | :heavy_check_mark: |
 | <!-- --> <!-- linter-icon -->                                                                                                                                       |                                                                                                         | [v8r](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_v8r.md#readme)                                               | [JSON_V8R](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_v8r.md#readme)                                                   |                    |
+| <!-- --> <!-- linter-icon -->                                                                                                                                       |                                                                                                         | [prettier](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_prettier.md#readme)                                     | [JSON_PRETTIER](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/json_prettier.md#readme)                                         | :heavy_check_mark: |
 | <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/icons/latex.ico" alt="" height="32px" class="megalinter-icon"></a> <!-- linter-icon -->    | [**LATEX**](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/latex.md#readme)       | [chktex](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/latex_chktex.md#readme)                                        | [LATEX_CHKTEX](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/latex_chktex.md#readme)                                           |                    |
 | <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/icons/markdown.ico" alt="" height="32px" class="megalinter-icon"></a> <!-- linter-icon --> | [**MARKDOWN**](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/markdown.md#readme) | [markdownlint](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/markdown_markdownlint.md#readme)                         | [MARKDOWN_MARKDOWNLINT](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/markdown_markdownlint.md#readme)                         | :heavy_check_mark: |
 | <!-- --> <!-- linter-icon -->                                                                                                                                       |                                                                                                         | [remark-lint](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/markdown_remark_lint.md#readme)                           | [MARKDOWN_REMARK_LINT](https://github.com/nvuillam/mega-linter/tree/master/docs/descriptors/markdown_remark_lint.md#readme)                           | :heavy_check_mark: |
@@ -618,7 +619,7 @@ To improve run performances, we generate **Flavored Mega-Linter images** contain
 <!-- flavors-table-start -->
 | <!-- -->                                                                                                                                                  | Flavor                                                                                                    | Description                                                            | Embedded linters | Info                                                                                                                                                                                               |
 |-----------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------|------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/images/mega-linter-square.png" alt="" height="32px" class="megalinter-icon"></a> | [all](https://nvuillam.github.io/mega-linter/supported-linters/)                                          | Default Mega-Linter Flavor                                             | 84               | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/nvuillam/mega-linter/v4) ![Docker Pulls](https://img.shields.io/docker/pulls/nvuillam/mega-linter)                             |
+| <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/images/mega-linter-square.png" alt="" height="32px" class="megalinter-icon"></a> | [all](https://nvuillam.github.io/mega-linter/supported-linters/)                                          | Default Mega-Linter Flavor                                             | 85               | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/nvuillam/mega-linter/v4) ![Docker Pulls](https://img.shields.io/docker/pulls/nvuillam/mega-linter)                             |
 | <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/icons/ci_light.ico" alt="" height="32px" class="megalinter-icon"></a>            | [ci_light](https://github.com/nvuillam/mega-linter/tree/master/docs/flavors/ci_light.md#readme)           | Optimized for CI items (Dockerfile, Jenkinsfile, JSON/YAML schemas,XML | 12               | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/nvuillam/mega-linter-ci_light/v4) ![Docker Pulls](https://img.shields.io/docker/pulls/nvuillam/mega-linter-ci_light)           |
 | <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/icons/dart.ico" alt="" height="32px" class="megalinter-icon"></a>                | [dart](https://github.com/nvuillam/mega-linter/tree/master/docs/flavors/dart.md#readme)                   | Optimized for DART based projects                                      | 38               | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/nvuillam/mega-linter-dart/v4) ![Docker Pulls](https://img.shields.io/docker/pulls/nvuillam/mega-linter-dart)                   |
 | <img src="https://github.com/nvuillam/mega-linter/raw/master/docs/assets/icons/documentation.ico" alt="" height="32px" class="megalinter-icon"></a>       | [documentation](https://github.com/nvuillam/mega-linter/tree/master/docs/flavors/documentation.md#readme) | Mega-Linter for documentation projects                                 | 37               | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/nvuillam/mega-linter-documentation/v4) ![Docker Pulls](https://img.shields.io/docker/pulls/nvuillam/mega-linter-documentation) |