Merge pull request #1 from postcss/master

merge

.travis.yml

@@ -1,7 +1,8 @@
 sudo: false
 language: node_js
 node_js:
-  - stable
-  - 6
+  - node
+  - "12"
+  - "10"
 after_success:
   - "npm run coveralls"

README.md

@@ -8,7 +8,7 @@ several plugins, but parse CSS only once.
 
 ## Install
 
-    $ npm install --save-dev gulp-postcss
+    $ npm install --save-dev postcss gulp-postcss
 
 Install required [postcss plugins](https://www.npmjs.com/browse/keyword/postcss-plugin) separately. E.g. for autoprefixer, you need to install [autoprefixer](https://github.com/postcss/autoprefixer) package.
 
@@ -48,6 +48,30 @@ gulp.task('css', function () {
 });
 ```
 
+## Using with .pcss extension
+
+For using gulp-postcss to have input files in .pcss format and get .css output need additional library like gulp-rename.
+
+```js
+var postcss = require('gulp-postcss');
+var gulp = require('gulp');
+const rename = require('gulp-rename');
+
+gulp.task('css', function () {
+    return gulp.src('./src/*.pcss')
+        .pipe(postcss())
+        .pipe(rename({
+          extname: '.css'
+        }))
+        .pipe(gulp.dest('./dest'));
+});
+```
+
+This is done for more explicit transformation. According to [gulp plugin guidelines](https://github.com/gulpjs/gulp/blob/master/docs/writing-a-plugin/guidelines.md#guidelines)
+
+> Your plugin should only do one thing, and do it well.
+
+
 ## Passing additional options to PostCSS
 
 The second optional argument to gulp-postcss is passed to PostCSS.
@@ -169,6 +193,11 @@ module.exports = function (ctx) {
 
 ## Changelog
 
+* 9.0.0
+  * Bump PostCSS to 8.0
+  * Drop Node 6 support
+  * PostCSS is now a peer dependency
+
 * 8.0.0
   * Bump PostCSS to 7.0
   * Drop Node 4 support

package.json

@@ -13,11 +13,11 @@
     "all": true,
     "check-coverage": true
   },
-  "version": "8.0.0",
+  "version": "9.0.0",
   "description": "PostCSS gulp plugin",
   "main": "index.js",
   "engines": {
-    "node": ">=6"
+    "node": "^10 || ^12 || >=14"
   },
   "scripts": {
     "coveralls": "coveralls < coverage/lcov.info",
@@ -43,8 +43,7 @@
   "dependencies": {
     "fancy-log": "^1.3.3",
     "plugin-error": "^1.0.1",
-    "postcss": "^7.0.14",
-    "postcss-load-config": "^2.0.0",
+    "postcss-load-config": "^2.1.1",
     "vinyl-sourcemaps-apply": "^0.2.1"
   },
   "devDependencies": {
@@ -53,8 +52,12 @@
     "gulp-sourcemaps": "^2.6.5",
     "mocha": "^5.2.0",
     "nyc": "^12.0.2",
+    "postcss": "^8.0.0",
     "proxyquire": "^2.1.0",
     "sinon": "^6.3.5",
     "vinyl": "^2.2.0"
+  },
+  "peerDependencies": {
+    "postcss": "^8.0.0"
   }
 }