Use GitHub Actions for CI

.github/workflows/tests.yml

@@ -0,0 +1,21 @@
+name: Tests
+
+on: [push]
+
+jobs:
+  brakeman:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby:
+          - '2.7'
+          - '3.0'
+          - '3.1'
+    name: Ruby ${{ matrix.ruby }} tests
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        bundler-cache: true
+        ruby-version: ${{ matrix.ruby }}
+    - run: bundle exec rake test

.gitignore

@@ -1 +1,2 @@
+/Gemfile.lock
 rdoc

Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gemspec

stemmify.gemspec

@@ -13,6 +13,8 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 #  s.rubygems_version = "0.0.1"
   s.summary = "Stemming reducing an inflected word to its root form (approximately). For example, running reduces to run."
+
+  s.add_development_dependency 'rake'
   s.add_development_dependency('rdoc', '>=3.9.1')
+  s.add_development_dependency 'test-unit'
 end
-