Update README.md to include example for OAuth2

Couldn't figure out how to authenticate with OAuth2 until I found this comment in the issues: bitbucket-rest-api#62 (comment) . This example should help with that.
ibrahima · Nov 16, 2016 · 248709a · 248709a
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diff --git a/README.md b/README.md
@@ -34,6 +34,12 @@ At this stage you can also supply various configuration parameters, such as `:us
 bitbucket = BitBucket.new oauth_token: 'request_token', oauth_secret: 'request_secret'
 ```
 
+or for OAuth2:
+
+```ruby
+bitbucket = BitBucket.new new_access_token: 'oauth2_access_token'
+```
+
 Alternatively, you can configure the BitBucket settings by passing a block:
 
 ```ruby