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

@@ -2,18 +2,18 @@
 
 Save and load NumPy `npy` and `npz` files in Ruby - no Python required
 
 :fire: Uses [Numo](https://github.com/ruby-numo/numo-narray) for blazing performance
 
-[![Build Status](https://travis-ci.org/ankane/npy.svg?branch=master)](https://travis-ci.org/ankane/npy)
+[![Build Status](https://github.com/ankane/npy/workflows/build/badge.svg?branch=master)](https://github.com/ankane/npy/actions)
 
 ## Installation
 
 Add this line to your application’s Gemfile:
 
 ```ruby
-gem 'npy'
+gem "npy"
 ```
 
 ## Getting Started
 
 ### npy
@@ -88,5 +88,14 @@
 
 - [Report bugs](https://github.com/ankane/npy/issues)
 - Fix bugs and [submit pull requests](https://github.com/ankane/npy/pulls)
 - Write, clarify, or fix documentation
 - Suggest or add new features
+
+To get started with development:
+
+```sh
+git clone https://github.com/ankane/npy.git
+cd npy
+bundle install
+bundle exec rake test
+```