CI -> Github actions

.github/workflows/ruby.yml

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+name: Puma
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  test:
+    name: Ruby ${{ matrix.ruby }} and ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ 'ubuntu-16.04', 'ubuntu-18.04', 'macos', 'windows-latest' ]
+        ruby: [ '2.3.x', '2.4.x', '2.5.x', '2.6.x' ]
+        exclude:
+          - os: ubuntu-16.04
+            ruby: 2.4.x
+          - os: ubuntu-16.04
+            ruby: 2.5.x
+          - os: ubuntu-16.04
+            ruby: 2.6.x
+          - os: ubuntu-18.04
+            ruby: 2.3.x
+          - os: macos
+            ruby: 2.3.x
+          - os: windows-latest
+            ruby: 2.3.x
+    steps:
+    - name: macOS install ragel
+      if: matrix.os == 'macos'
+      run: |
+        brew install ragel
+    - name: repo checkout
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 10
+    - name: load ruby
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+
+    # Windows only
+    - name: Add MSYS2 paths
+      uses: MSP-Greg/msys2-action/add_paths@master
+      if:   matrix.os == 'windows-latest'
+    - name: Update MSYS2
+      uses: MSP-Greg/msys2-action/update_msys2@master
+      if:   matrix.os == 'windows-latest'
+    - name: Update OpenSSL
+      uses: MSP-Greg/msys2-action/update_openssl@master
+      if:   matrix.os == 'windows-latest'
+
+    - name: RubyGems, Bundler Update
+      run:  gem update --system --no-document --conservative
+    - name: bundle install
+      run: |
+        gem update --system --no-document --conservative
+        bundle install --jobs 4 --retry 3
+    - name: compile
+      run: bundle exec rake compile
+    - name: test
+      env:
+        CI: true
+        TESTOPTS: -v
+      run: bundle exec rake