Updated README and version for Rubygems

README.md

@@ -10,11 +10,11 @@ Add this line to your application's Gemfile:
 
 Then execute:
 
-    $ bundle install
+    bundle install
 
 Or install it yourself as:
 
-    $ gem install coinbase
+    gem install coinbase
 
 ## Authentication
 
@@ -58,6 +58,8 @@ client.refresh!
 client.revoke!
 ```
 
+_Protip:tm::_ You can test OAuth2 authentication easily with Developer Access Tokens which can be created under your [OAuth2 application settings](https://www.coinbase.com/settings/api). These are short lived tokens which authenticate but don't require full OAuth2 handshake to obtain.
+
 #### Two factor authentication
 
 Send money endpoint requires 2FA token in certain situations (read more [here](https://developers.coinbase.com/docs/wallet/coinbase-connect#two-factor-authentication)). Specific exception is thrown when this is required:
@@ -576,3 +578,13 @@ checkout.orders
 checkout = client.checkout(checkout_id)
 checkout.create_order(amount: "1", currency: "BTC", name: "Order #1234")
 ```
+
+## Contributing and testing
+
+Any and all contributions are welcome! The process is simple: fork this repo, make your changes, add tests, run the test suite, and submit a pull request. Tests are run via rspec. To run the tests, clone the repository and then:
+
+    # Install the requirements
+    gem install coinbase
+
+    # Run tests
+    rspec spec

lib/coinbase/wallet/version.rb

@@ -1,5 +1,5 @@
 module Coinbase
   module Wallet
-    VERSION = "4.0.1"
+    VERSION = "4.0.2"
   end
 end