Migrated from travis to github workflows

.github/workflows/lint.yml

@@ -0,0 +1,46 @@
+name: Lint
+
+on:
+   push:
+      branches:
+         - "master"
+   pull_request:
+      branches:
+         - "*"
+
+jobs:
+   lint:
+      runs-on: ubuntu-latest
+      steps:
+         - name: Checkout
+           uses: actions/checkout@v2
+
+         - name: Setup PHP
+           uses: shivammathur/setup-php@v2
+           with:
+              php-version: "7.1"
+              extensions: intl, mbstring, mcrypt, openssl
+              tools: composer
+
+         - name: Setup problem matchers
+           run: |
+              echo "::add-matcher::${{ runner.tool_cache }}/php.json"
+
+         - 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
+           if: steps.composer-cache.outputs.cache-hit != 'true'
+           run: composer install --prefer-dist --no-progress --no-suggest
+
+         - name: PHPCS check
+           uses: chekalsky/phpcs-action@v1
+           with:
+              enable_warnings: true
+              phpcs_bin_path: "./vendor/bin/phpcs"