Add badges

README.md

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+[![Build Status](https://travis-ci.com/finch/finch-oauth2.svg?branch=master)](https://travis-ci.com/finch/finch-oauth2)
+[![Maven Central](https://img.shields.io/maven-central/v/com.github.finagle/finch-oauth2_2.12.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.finagle/finch-oauth2_2.12)
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+----
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 This project provides OAuth2 support backed by the [finagle-oauth2][finagle-oauth2] library.
 
 The project is published in Maven Central. Adding it to sbt is as follows:
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 There are usage examples in [finch documentation](finch-oauth-cookbook).
 
 [finagle-oauth2]: https://github.com/finagle/finagle-oauth2
-[finch-oauth-cookbook]: http://finagle.github.io/finch/cookbook.html#oauth2
+[finch-oauth-cookbook]: http://finagle.github.io/finch/cookbook.html#oauth2