Trigger CI on push and PR

.github/workflows/ci.yml

@@ -1,5 +1,10 @@
 name: CI
-on: [pull_request]
+on:
+  push:
+    branches: [ master, release* ]
+    tags: [v*]
+  pull_request:
+    branches: [ master, release* ]
 
 defaults:
   run: 

Rakefile

@@ -39,55 +39,4 @@ task :changelog, :since_c, :until_c do |t,args|
   end
 
   puts changelog_content
-end
-
-desc "Generates travis.yaml"
-task :gen_travis do
-  versions = []
-
-  def versions.add(major:, minor:, include_macos: true)
-    self << { major: major, minor: [minor], include_macos: include_macos }
-  end
-
-  versions.add major: '3.0', minor: 1
-  versions.add major: '2.7', minor: 3
-  versions.add major: '2.6', minor: 7
-  versions.add major: '2.5', minor: 9
-  versions.add major: '2.4', minor: 10
-  versions.add major: '2.3', minor: 8, include_macos: false
-  versions.add major: '2.2', minor: 10, include_macos: false
-  versions.add major: '2.1', minor: 10, include_macos: false
-  versions.add major: '2.0', minor: 0, include_macos: false
-  versions.add major: '1.9', minor: 3, include_macos: false
-  versions.add major: '1.8', minor: 7, include_macos: false
-
-  puts <<EOM
-language: ruby
-dist: trusty
-matrix:
-  fast_finish: true
-  include:
-EOM
-
-  loop do
-    found_some = false
-
-    versions.each do |version|
-      minor = version[:minor].pop
-      if minor
-        found_some = true
-        full_version = "#{version[:major]}.#{minor}"
-        puts <<EOM
-    - os: linux
-      rvm: #{full_version}
-EOM
-        puts <<EOM if version[:include_macos]
-    - os: osx
-      rvm: #{full_version}
-EOM
-      end
-    end
-
-    break unless found_some
-  end
 end