Add github actions

.github/workflows/composer.yml

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+name: Composer outdated
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '7.1', '7.2', '7.3', '7.4' ]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+
+    - name: Validate composer.json
+      run: composer validate --strict
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+
+    - name: Composer outdated
+      run: composer outdated -D --strict

.github/workflows/extensions_finder.yml

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+name: Extensions finder
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '7.1', '7.2', '7.3', '7.4' ]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+
+    - name: Validate composer.json
+      run: composer validate --strict
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+
+    - name: PHP extensions finder
+      run: vendor/bin/php-extensions-finder check src bin tests

.github/workflows/phpstan.yml

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+name: PHPstan
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '7.1', '7.2', '7.3', '7.4' ]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+
+    - name: Validate composer.json
+      run: composer validate --strict
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+
+    - name: Install PHPStan
+      run: composer require phpstan/phpstan --dev
+
+    - name: PHPStan analyse
+      run: vendor/bin/phpstan analyze src --level=max --no-progress

.github/workflows/sniffer.yml

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+name: Sniffer
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '7.1', '7.2', '7.3', '7.4' ]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+
+    - name: Validate composer.json
+      run: composer validate --strict
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+
+    - name: Check syntax
+      run: find src bin tests -name "*.php" -print0 | xargs -0 -n1 -P8 php -l

.github/workflows/syntax_checker.yml

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+name: Syntax checker
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '7.1', '7.2', '7.3', '7.4' ]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+
+    - name: Validate composer.json
+      run: composer validate --strict
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-interaction
+
+    - name: Code sniffer
+      run: vendor/bin/phpcs src bin --standard=PSR2 -n