Compatibility with WordPress 5.3 (#15)

* Declare compatiblity with WP 5.3, update depenencies, test wth PHP 7.4

* Don't test with PHP 7.4 yet

Author: patrickrobrecht

composer.json

@@ -15,17 +15,17 @@
     "source": "https://github.com/patrickrobrecht/posts-and-users-stats"
   },
   "require": {
-    "php": "^5.6|^7",
-    "npm-asset/chartist": "^0.11.0",
-    "npm-asset/chartist-plugin-axistitle": "^0.0.5",
-    "npm-asset/moment": "^2.21.0"
+    "php": ">=5.6",
+    "npm-asset/chartist": "^0.11.4",
+    "npm-asset/chartist-plugin-axistitle": "^0.0.6",
+    "npm-asset/moment": "^2.24.0"
   },
   "require-dev": {
     "dealerdirect/phpcodesniffer-composer-installer": "^0.4",
     "matthiasmullie/minify": "^1.3",
-    "phpcompatibility/php-compatibility": "^9.1",
-    "slowprog/composer-copy-file": "^0.2",
-    "squizlabs/php_codesniffer": "^3.1",
+    "phpcompatibility/php-compatibility": "^9.3",
+    "slowprog/composer-copy-file": "^0.3",
+    "squizlabs/php_codesniffer": "^3.5",
     "wp-coding-standards/wpcs": "^2.1"
   },
   "repositories": [

composer.lock

@@ -2,7 +2,7 @@
 Contributors: patrickrobrecht
 Tags: dashboard, statistics
 Requires at least: 4.4
-Tested up to: 5.2
+Tested up to: 5.3
 Requires PHP: 5.6
 Stable tag: 1.1.2
 License: GPLv3