README.md in str_enum-0.2.0 vs README.md in str_enum-0.3.0

@@ -7,18 +7,18 @@
 - scopes
 - validations
 - accessor methods
 - update methods
 
-[![Build Status](https://travis-ci.org/ankane/str_enum.svg?branch=master)](https://travis-ci.org/ankane/str_enum)
+[![Build Status](https://github.com/ankane/str_enum/workflows/build/badge.svg?branch=master)](https://github.com/ankane/str_enum/actions)
 
 ## Getting Started
 
 Add this line to your application’s Gemfile:
 
 ```ruby
-gem 'str_enum'
+gem "str_enum"
 ```
 
 Add a string column to your model.
 
 ```ruby
@@ -121,5 +121,14 @@
 
 - [Report bugs](https://github.com/ankane/str_enum/issues)
 - Fix bugs and [submit pull requests](https://github.com/ankane/str_enum/pulls)
 - Write, clarify, or fix documentation
 - Suggest or add new features
+
+To get started with development and testing:
+
+```sh
+git clone https://github.com/ankane/str_enum.git
+cd str_enum
+bundle install
+bundle exec rake test
+```