Start using github actions

Travis is very slow

Author: eigan

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  tests:
+    name: Tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        php: ['7.3', '7.4']
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: phpunit, git
+          coverage: pcov
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - name: Cache composer dependencies
+        uses: actions/cache@v1
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+      - name: Install Composer dependencies
+        run: composer install --no-progress --no-suggest --prefer-dist --optimize-autoloader
+      - name: PHPUnit
+        run: vendor/bin/phpunit --coverage-clover=coverage.xml --coverage-text
+      - uses: codecov/codecov-action@v1
+        with:
+          file: ./coverage.xml