Documentation update.

Author: aaronj-ep

README.markdown

@@ -1,32 +1,18 @@
 PropelBundle
 ============
 
-[![Build Status](https://secure.travis-ci.org/propelorm/PropelBundle.png)](http://travis-ci.org/propelorm/PropelBundle)
-[![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/propelorm/PropelBundle?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-
-This is the official implementation of [Propel](http://www.propelorm.org/) in Symfony2.
+This an unofficial implementation of [Propel 1.6](http://www.propelorm.org/) in Symfony, which has been modified to work
+with PHP 7.2+ and Symfony 3.0+.
 
 ## Branching model
 
 ### Propel1 integration
 
 The two major branches being supported are:
 
-* The `1.5` branch contains Propel *1.6+* integration for Symfony *2.8 LTS*.
-* The `1.6` branch contains Propel *1.6+* integration for Symfony *3.0*.
-
-If you are running on an older version, you may require one of the following versions of this bundle.
-
-* The `1.0` branch contains Propel *1.6* integration for Symfony *2.0*.
-* The `1.1` branch contains Propel *1.6* integration for Symfony *2.1*.
-* The `1.2` branch contains Propel *1.6* integration for Symfony *>2.1*.
-* The `1.4` branch contains Propel *1.6* integration for Symfony *>2.3*.
-
-### Propel2 integration
-
-* The `2.0` branch will contain `Propel2` integration for Symfony *3.0*.
+* The `1.7` branch contains Propel *1.6* integration for Symfony *3.x* and PHP *7.2+*.
 
-**Note:** the `master` branch won't be updated anymore, and will trigger an `E_USER_DEPRECATED` error to notice people.
+**Note:** Only the 1.7 branch is maintained in this fork.  For newer _or_ older versions, please use the [original repo](https://github.com/propelorm/PropelBundle).
 
 ## Features