added license checking github action + composer update

.github/workflows /php-ci.yml

@@ -0,0 +1,33 @@
+name: PHP Continuous Integration
+
+on:
+  push:
+    branches: [ $default-branch ]
+  pull_request:
+    branches: [ $default-branch ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Check vendor licenses
+        run: composer run-script lic-check

composer.json

@@ -26,5 +26,8 @@
   },
   "config": {
     "sort-packages": true
+  },
+  "scripts": {
+    "lic-check": "license-checker check"
   }
 }