ci: Add Travis config (#3)

* ci: Add Travis config

* travis: Install rake-compiler, build extension

* travis: rake compile without bundle

* travis: Move rake compile to before_install

* gemspec: Add minitest dep

* Gemfile: Remove lockfile

Author: woodruffw

.travis.yml

@@ -0,0 +1,13 @@
+language: ruby
+rvm:
+    - 2.3
+    - 2.4
+    - 2.5
+    - 2.6
+cache: bundler
+before_install:
+    - gem update --system
+    - gem install bundler rake-compiler
+    - rake compile
+script:
+  - bundle exec rake

Gemfile.lock

@@ -14,6 +14,7 @@ Gem::Specification.new do |s|
   s.homepage = "https://github.com/woodruffw/ruby-inih"
   s.license = "MIT"
 
+  s.add_development_dependency "minitest"
   s.add_development_dependency "rake-compiler"
   s.add_development_dependency "yard"
 end