Add GitHub Actions CI setup to replace Travis

.github/workflows/ci.yml

@@ -0,0 +1,56 @@
+---
+name: CI
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - "examples/**"
+      - "*.md"
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - "examples/**"
+      - "*.md"
+jobs:
+  tests:
+    name: Ruby ${{ matrix.ruby }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+        ruby:
+          - 2.1
+          - 2.2
+          - 2.3
+          - 2.4
+          - 2.5
+          - 2.6
+          - 3.0
+          - ruby-head
+          - jruby-9.2.13.0
+          - jruby-head
+          - truffleruby-head
+        include:
+          - ruby: 2.7
+            os: ubuntu-latest
+            coverage: true
+    env:
+      COVERAGE: ${{ matrix.coverage }}
+      COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+    continue-on-error: ${{ endsWith(matrix.ruby, 'head') }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - name: Install bundler
+        run: gem install bundler -v '< 2.0'
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
+      - name: Run tests
+        run: bundle exec rake ci

README.md

@@ -5,14 +5,14 @@
 # Pastel
 
 [![Gem Version](https://badge.fury.io/rb/pastel.svg)][gem]
-[![Build Status](https://secure.travis-ci.org/piotrmurach/pastel.svg?branch=master)][travis]
+[![Actions CI](https://github.com/piotrmurach/pastel/workflows/CI/badge.svg?branch=master)][gh_actions_ci]
 [![Build status](https://ci.appveyor.com/api/projects/status/9blbjfq42o4v1rk4?svg=true)][appveyor]
 [![Code Climate](https://codeclimate.com/github/piotrmurach/pastel/badges/gpa.svg)][codeclimate]
 [![Coverage Status](https://coveralls.io/repos/github/piotrmurach/pastel/badge.svg)][coverage]
 [![Inline docs](http://inch-ci.org/github/piotrmurach/pastel.svg?branch=master)][inchpages]
 
 [gem]: http://badge.fury.io/rb/pastel
-[travis]: http://travis-ci.org/piotrmurach/pastel
+[gh_actions_ci]: https://github.com/piotrmurach/pastel/actions?query=workflow%3ACI
 [appveyor]: https://ci.appveyor.com/project/piotrmurach/pastel
 [codeclimate]: https://codeclimate.com/github/piotrmurach/pastel
 [coverage]: https://coveralls.io/github/piotrmurach/pastel

spec/spec_helper.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-if ENV["COVERAGE"] || ENV["TRAVIS"]
+if ENV["COVERAGE"] == "true"
   require "simplecov"
   require "coveralls"