[TASK] Move PHP linting to GitHub actions (#28)

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+on:
+  - pull_request
+  - push
+
+name: CI
+
+jobs:
+  php-lint:
+    name: PHP linter
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+          - 7.2
+          - 7.3
+          - 7.4
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+
+    - name: Run PHP lint
+      run: composer ci:php:lint

.travis.yml

@@ -32,11 +32,6 @@ install:
   git checkout .;
 
 script:
-- >
-  echo;
-  echo "Linting all PHP files";
-  composer ci:php:lint;
-
 - >
   echo;
   echo "Linting all TypoScript files";

CHANGELOG.md

@@ -16,6 +16,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Composer script for PHP linting
 
 ### Changed
+- Moved PHP linting to GitHub actions (#12)
 - Use `.typoscript` as file extension for TS files (#19)
 - Convert the PHP namespaces to "TTN" (#8)
 - Update the contact email in the CoC document (#6)