Use gh actions for ci (#47)

* Upgrade ruby, bundler, and rubocop

* Build and test with gh actions

* Pin back to old versions for now

* Require ruby version in gemspec

* Test with a matrix of ruby versions

Author: adamrdavid

.github/workflows/build_and_test.yml

@@ -0,0 +1,27 @@
+name: Build and test
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby: [ '2.5', '2.6.x', '2.x']
+    name: Test gem in ruby version ${{ matrix.ruby }}
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Ruby ${{ matrix.ruby }}
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+    - name: Build with dependencies
+      run: |
+        gem install bundler -v 1.17
+        bundle install
+    - name: Test with rspec
+      run: |
+        bundle exec rspec spec/
+    - name: Lint with rubocop
+      run: |
+        bundle exec rubocop

vrt.gemspec

@@ -15,11 +15,12 @@ Gem::Specification.new do |spec|
   spec.license       = 'MIT'
   spec.files         = Dir['lib/**/*.{rb,json}']
   spec.require_paths = ['lib']
+  spec.required_ruby_version = '>= 2.5'
 
   spec.add_development_dependency 'bundler', '~> 1.14'
-  spec.add_development_dependency 'pry'
-  spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'rspec'
+  spec.add_development_dependency 'pry', '~> 0.11'
+  spec.add_development_dependency 'rake', '~> 12.3'
+  spec.add_development_dependency 'rspec', '~> 3.6'
   # TODO: investigate why rubocop's jaro-winkler dependency fails to install in our alpine linux image
   spec.add_development_dependency 'rubocop', '0.56.0'
 end