chore: update postcss version to 8 (#325)

* chore: update postcss version to 8

* docs: update README installation instructions

* chore: remove legacy postcss dependecy

* chore: add postcss to dev dependencies

Co-authored-by: Edward Elric <SASUKE688848@gmail.com>

README.md

@@ -12,7 +12,7 @@ Seamless integration between [Rollup](https://github.com/rollup/rollup) and [Pos
 ## Install
 
 ```bash
-yarn add rollup-plugin-postcss --dev
+yarn add postcss rollup-plugin-postcss --dev
 ```
 
 ## Usage

package.json

@@ -44,6 +44,7 @@
     "jest": "^25.3.0",
     "less": "^3.11.1",
     "node-sass": "^4.13.1",
+    "postcss": "^8.0.0",
     "rollup": "^2.6.1",
     "stylus": "^0.54.7",
     "sugarss": "^2.0.0",
@@ -56,7 +57,6 @@
     "import-cwd": "^3.0.0",
     "p-queue": "^6.3.0",
     "pify": "^5.0.0",
-    "postcss": "^7.0.27",
     "postcss-load-config": "^2.1.0",
     "postcss-modules": "^2.0.0",
     "promise.series": "^0.2.0",
@@ -65,6 +65,9 @@
     "safe-identifier": "^0.4.1",
     "style-inject": "^0.3.0"
   },
+  "peerDependencies": {
+    "postcss": "^8.0.0"
+  },
   "xo": {
     "extends": "rem",
     "envs": [

yarn.lock

@@ -2877,6 +2877,11 @@ color@^3.0.0:
     color-convert "^1.9.1"
     color-string "^1.5.2"
 
+colorette@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.1.tgz#4d0b921325c14faf92633086a536db6e89564b1b"
+  integrity sha512-puCDz0CzydiSYOrnXpz/PKd69zRrribezjtE9yd4zvytoRc8+RY/KJPvtPFKZS3E3wP6neGyMe0vOTlHO5L3Pw==
+
 colors@^1.1.2:
   version "1.3.3"
   resolved "https://registry.npmjs.org/colors/-/colors-1.3.3.tgz#39e005d546afe01e01f9c4ca8fa50f686a01205d"
@@ -6255,6 +6260,14 @@ line-column-path@^2.0.0:
   dependencies:
     type-fest "^0.4.1"
 
+line-column@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/line-column/-/line-column-1.0.2.tgz#d25af2936b6f4849172b312e4792d1d987bc34a2"
+  integrity sha1-0lryk2tvSEkXKzEuR5LR2Ye8NKI=
+  dependencies:
+    isarray "^1.0.0"
+    isobject "^2.0.0"
+
 lines-and-columns@^1.1.6:
   version "1.1.6"
   resolved "https://registry.npm.taobao.org/lines-and-columns/download/lines-and-columns-1.1.6.tgz#1c00c743b433cd0a4e80758f7b64a57440d9ff00"
@@ -6721,6 +6734,11 @@ nan@^2.13.2:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
   integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==
 
+nanoid@^3.1.12:
+  version "3.1.12"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.12.tgz#6f7736c62e8d39421601e4a0c77623a97ea69654"
+  integrity sha512-1qstj9z5+x491jfiC4Nelk+f8XBad7LN20PmyWINJEMRSf3wcAjAWysw1qaA8z6NSKe2sjq1hRSDpBH5paCb6A==
+
 nanomatch@^1.2.9:
   version "1.2.13"
   resolved "https://registry.npmjs.org/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
@@ -8074,6 +8092,16 @@ postcss@^7.0.2, postcss@^7.0.27:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
+postcss@^8.0.0:
+  version "8.0.9"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.0.9.tgz#d112fc1e8bbed550657901550fa736ae3dd25ec5"
+  integrity sha512-9Ikq03Hvb/L6dgnOtNOUbcgg9Rsff5uKrI1TyNTQ2ALpa6psZk1Ar3/Hhxv2Q0rECRGDxtcMUTZIQglXozlrDQ==
+  dependencies:
+    colorette "^1.2.1"
+    line-column "^1.0.2"
+    nanoid "^3.1.12"
+    source-map "^0.6.1"
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"