Move CI to GitHub actions, drop support for Ruby < 2.5 (#35)

Author: thbar

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI build
+on: [push, pull_request]
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        ruby:
+          - '2.5'
+          - '2.6'
+          - '2.7'
+          - '3.0'
+          - head
+          - jruby
+          - jruby-head
+          - truffleruby
+          - truffleruby-head
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - run: bundle exec rake
+  # What's below helps having a single "status check" for mergeability, without
+  # having to add each new version to the list of expected status checks in GitHub.
+  # See https://github.community/t/status-check-for-a-matrix-jobs/127354/7 
+  global:
+    if: ${{ always() }}
+    runs-on: ubuntu-latest
+    name: build (matrix)
+    needs: build
+    steps:
+      - name: Check build matrix status
+        if: ${{ needs.build.result != 'success' }}
+        run: exit 1

.travis.yml

@@ -1,3 +1,9 @@
+HEAD
+----
+
+- Drop support for Ruby < 2.5
+- Add compatibility for Kiba 4
+
 1.1.0
 ----
 

Changes.md

@@ -1,6 +1,7 @@
 Kiba Common is a companion gem to [Kiba](https://github.com/thbar/kiba) and [Kiba Pro](https://github.com/thbar/kiba/blob/master/Pro-Changes.md) in which I'll share commonly used helpers.
 
-[![Build Status](https://travis-ci.org/thbar/kiba-common.svg?branch=master)](https://travis-ci.org/thbar/kiba-common) [![Gem Version](https://badge.fury.io/rb/kiba-common.svg)](https://badge.fury.io/rb/kiba-common)
+[![Gem Version](https://badge.fury.io/rb/kiba-common.svg)](https://badge.fury.io/rb/kiba-common)
+[![Build Status](https://github.com/thbar/kiba-common/actions/workflows/ci.yml/badge.svg)](https://github.com/thbar/kiba-common/actions) 
 
 ## Usage
 
@@ -14,7 +15,8 @@ Then see below for each module usage & require clause.
 
 ## Supported Ruby versions
 
-`kiba-common` currently supports Ruby 2.3+ and JRuby (with its default 1.9 syntax). See [test matrix](https://travis-ci.org/thbar/kiba-common).
+`kiba-common` currently supports Ruby 2.5+, JRuby 9.2+ and TruffleRuby. See [test matrix](https://github.com/thbar/kiba-common/actions).
+
 
 ## Available components