update README markdown to break to multiple lines

Author: seanlinsley

README.md

@@ -12,19 +12,24 @@ Active Admin is a Ruby on Rails framework for creating elegant backends for webs
 
 ## State of the project
 
-We're [currently working on 1.0.0](https://github.com/gregbell/active_admin/issues?milestone=18), which as far as dependencies, moves us from meta_search to Ransack and adds Rails 4 support. Until it's ready, you can get Rails 4 support today by tracking master:
+We're [currently working on 1.0.0](https://github.com/gregbell/active_admin/issues?milestone=18),
+which as far as dependencies, moves us from meta_search to Ransack and adds Rails 4 support.
+Until it's ready, you can get Rails 4 support today by tracking master:
 
 ```ruby
 gem 'activeadmin', github: 'gregbell/active_admin'
 ```
 
-The plan is to follow [semantic versioning](http://semver.org/) as of 1.0.0. The 0.6.x line will still be maintained, and we will backport bug fixes into future 0.6.x releases. If you don't want to have to wait for a release, you can track the branch instead:
+The plan is to follow [semantic versioning](http://semver.org/) as of 1.0.0. The 0.6.x line will
+still be maintained, and we will backport bug fixes into future 0.6.x releases. If you don't want
+to have to wait for a release, you can track the branch instead:
 
 ```ruby
 gem 'activeadmin', github: 'gregbell/active_admin', branch: '0-6-stable'
 ```
 
-Please note that <http://activeadmin.info> is out of date. For the latest docs, check out the Github repo itself.
+Please note that <http://activeadmin.info> is out of date. For the latest docs, check out the
+Github repo itself.
 
 ## Links