Use GitHub actions for CI and update dependencies.

Author: gkellogg

.github/workflows/ci.yml

@@ -0,0 +1,42 @@
+# This workflow runs continuous CI across different versions of ruby on all branches and pull requests to develop.
+
+name: CI
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the develop branch
+  push:
+    branches: [ '**' ]
+  pull_request:
+    branches: [ develop ]
+  workflow_dispatch:
+
+jobs:
+  tests:
+    name: Ruby ${{ matrix.ruby }}
+    if: "contains(github.event.commits[0].message, '[ci skip]') == false"
+    runs-on: ubuntu-latest
+    env:
+      CI: true
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - 2.4
+          - 2.5
+          - 2.6
+          - 2.7
+          - ruby-head
+          - jruby
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
+      - name: Run tests
+        run: bundle exec rspec spec
+ 

README.md

@@ -2,7 +2,9 @@
 JSON-LD with preloaded contexts.
 
 [![Gem Version](https://badge.fury.io/rb/json-ld-preloaded.png)](https://badge.fury.io/rb/json-ld-preloaded)
-[![Build Status](https://secure.travis-ci.org/ruby-rdf/json-ld-preloaded.png?branch=master)](https://travis-ci.org/ruby-rdf/json-ld-preloaded)
+[![Build Status](https://github.com/ruby-rdf/json-ld-preloaded/workflows/CI/badge.svg?branch=develop)](https://github.com/ruby-rdf/json-ld-preloaded/actions?query=workflow%3ACI)
+[![Coverage Status](https://coveralls.io/repos/ruby-rdf/json-ld-preloaded/badge.svg)](https://coveralls.io/github/ruby-rdf/json-ld-preloaded)
+[![Gitter chat](https://badges.gitter.im/ruby-rdf/rdf.png)](https://gitter.im/ruby-rdf/rdf)
 
 ## Features
 

json-ld-preloaded.gemspec

@@ -19,12 +19,12 @@ Gem::Specification.new do |gem|
   gem.require_paths         = %w(lib)
   gem.test_files            = Dir.glob('spec/**/*.rb') + Dir.glob('spec/test-files/*')
 
-  gem.required_ruby_version = '>= 2.2.2'
+  gem.required_ruby_version = '>= 2.4'
   gem.requirements          = []
   gem.add_runtime_dependency     'rdf',             '~> 3.1'
   gem.add_runtime_dependency     'json-ld',         '~> 3.1'
-  gem.add_development_dependency 'rspec',           '~> 3.9'
-  gem.add_development_dependency 'yard' ,           '~> 0.9.20'
+  gem.add_development_dependency 'rspec',           '~> 3.10'
+  gem.add_development_dependency 'yard' ,           '~> 0.9'
 
   gem.post_install_message  = nil
 end