Add CS workflows (#30)

.github/workflows/cs.yaml

@@ -0,0 +1,38 @@
+name: Coding Standards
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - master
+
+jobs:
+  coding-standards:
+    name: Coding Standards
+    runs-on: ubuntu-latest
+
+    env:
+      PHP_CS_FIXER_VERSION: v2.17.3
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+          coverage: none
+          tools: php-cs-fixer:${{ env.PHP_CS_FIXER_VERSION }}
+
+      - name: Restore PHP-CS-Fixer cache
+        uses: actions/cache@v2
+        with:
+          path: .php_cs.cache
+          key: "php-cs-fixer"
+          restore-keys: "php-cs-fixer"
+
+      - name: Run PHP-CS-Fixer, version ${{ env.PHP_CS_FIXER_VERSION }}
+        run: |
+          php-cs-fixer fix --diff --diff-format=udiff --dry-run --verbose

.travis.yml

@@ -10,6 +10,7 @@ php:
 cache:
   directories:
     - $HOME/.composer/cache
+    - $HOME/.cache/cache
     - build/cache
 
 install:

composer.json

@@ -36,7 +36,7 @@
         "pear/pear-core-minimal": "^1.10"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2.16",
+        "friendsofphp/php-cs-fixer": "^2",
         "php-coveralls/php-coveralls": "^2.2",
         "phpunit/phpunit": "<6.0"
     },