Fix readme formatting

Author: p

README.md

@@ -1,23 +1,21 @@
-Mongo Kerberos [![Build Status](https://secure.travis-ci.org/mongodb/mongo-ruby-kerberos.png?branch=master&.png)](http://travis-ci.org/mongodb/mongo-ruby-kerberos) [![Code Climate](https://codeclimate.com/github/mongodb/mongo-ruby-kerberos.png)](https://codeclimate.com/github/mongodb/mongo-ruby-kerberos) [![Coverage Status](https://coveralls.io/repos/mongodb/mongo-ruby-kerberos/badge.png?branch=master)](https://coveralls.io/r/mongodb/mongo-ruby-kerberos?branch=master)
-====
+# Mongo Kerberos [![Build Status](https://secure.travis-ci.org/mongodb/mongo-ruby-kerberos.png?branch=master&.png)](http://travis-ci.org/mongodb/mongo-ruby-kerberos) [![Code Climate](https://codeclimate.com/github/mongodb/mongo-ruby-kerberos.png)](https://codeclimate.com/github/mongodb/mongo-ruby-kerberos) [![Coverage Status](https://coveralls.io/repos/mongodb/mongo-ruby-kerberos/badge.png?branch=master)](https://coveralls.io/r/mongodb/mongo-ruby-kerberos?branch=master)
 
 Provides Kerberos authentication support to the Mongo Ruby Driver.
 
-Compatibility
--------------
+
+## Compatibility
 
 mongo_kerberos is tested against MRI (1.9.3+) and JRuby (9.1+).
 
-JRuby
-`````
+### JRuby
 
 In order to work with Kerberos TGTs that are in the system cache (e.g. obtained with `kinit`), the
 JRuby extension sets the JVM system property "sun.security.jgss.native" to "true". Note that any
 other use of the JGSS library will also be affected by this setting, meaning that any TGTs in the
 system cache will be available for obtaining Kerberos credentials as well.
 
-Installation
-------------
+
+## Installation
 
 libsasl is a requirement to be able to install the mongo_kerberos gem. Please see the
 [Cyrus documentation](http://cyrusimap.web.cmu.edu/docs/cyrus-sasl/2.1.25/) for more
@@ -36,14 +34,12 @@ require "mongo_kerberos"
 ```
 
 
-API Documentation
------------------
+## API Documentation
 
 The [API Documentation](http://rdoc.info/github/mongodb/mongo-ruby-kerberos/master/frames) is
 located at rdoc.info.
 
-Versioning
-----------
+## Versioning
 
 As of 2.1.0, this project adheres to the
 [Semantic Versioning Specification](http://semver.org/).