Switch from Travis CI to GitHub Actions

Author: jcoglan

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - ruby-2.4
+          - ruby-2.5
+          - ruby-2.6
+          - ruby-2.7
+          - ruby-3.0
+          - jruby-9.2
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - run: ruby --version
+      - run: bundle exec rspec

.travis.yml

@@ -1,4 +1,4 @@
-# faye-websocket [![Build status](https://secure.travis-ci.org/faye/faye-websocket-ruby.svg)](http://travis-ci.org/faye/faye-websocket-ruby)
+# faye-websocket
 
 This is a general-purpose WebSocket implementation extracted from the
 [Faye](http://faye.jcoglan.com) project. It provides classes for easily building