Update to PostCSS 8. Require NodeJS 10+

.gitignore

@@ -1,5 +1,6 @@
 node_modules/
 .*
 
+!.npmrc
 !.gitignore
 !.editorconfig

.npmrc

@@ -0,0 +1 @@
+package-lock=false

README.md

@@ -5,7 +5,7 @@ This webpack plugin gets css extracted by [MiniCssExtractPlugin](https://github.
 If you use postcss-loader, not all its plugins are effective in file-by-file processing. For instance, css structural optimizations or media query packaging better apply to one css production file that can be generated by MiniCssExtractPlugin.
 
 # Installation
-`npm i postcss-assets-webpack-plugin`
+`npm install --save-dev webpack postcss postcss-assets-webpack-plugin`
 
 # Options
 * `test` - regular expression for matching files returned from MiniCssExtractPlugin.
@@ -22,15 +22,15 @@ import mqpacker from 'mqpacker';
 import autoprefixer from 'autoprefixer';
 import MiniCssExtractPlugin from 'mini-css-extract-plugin';
 import PostCSSAssetsPlugin from 'postcss-assets-webpack-plugin';
- 
+
 const devMode = process.env.NODE_ENV !== 'production'
- 
+
 webpackConfig = {
   <...>
   postcss() {
     return [autoprefixer({browser: 'last 2 version', cascade: false})]
   },
-  
+
   module: {
     rules: [
       {
@@ -61,13 +61,13 @@ webpackConfig = {
       }
     ],
   },
-  
+
   plugins: [
     new MiniCssExtractPlugin({
       filename: devMode ? '[name].css' : '[name].[hash].css',
       chunkFilename: devMode ? '[id].css' : '[id].[hash].css',
     })
- 		
+
     new PostCSSAssetsPlugin({
       test: /\.css$/,
       log: true,

package.json

@@ -16,13 +16,17 @@
   },
   "main": "index.js",
   "peerDependencies": {
-    "webpack": "^4.10.2"
+    "postcss": "^8.0.9",
+    "webpack": "^4.40.0"
+  },
+  "devDependencies": {
+    "postcss": "^8.0.9",
+    "webpack": "^4.40.0"
   },
   "dependencies": {
-    "fancy-log": "^1.3.2",
+    "fancy-log": "^1.3.3",
     "human-size": "^1.1.0",
-    "postcss": "^7.0.0",
-    "webpack-sources": "^1.1.0"
+    "webpack-sources": "^1.4.0"
   },
   "keywords": [
     "css",
@@ -33,6 +37,6 @@
     "postcss-assets-webpack-plugin"
   ],
   "engines": {
-    "node": ">=6.0.0"
+    "node": ">=10.0.0"
   }
 }