Fix minor markdown issue and credit contributers.

Changes.mdown

-0.3 (released 2010/07/22):
---------------------------
+0.3:
+----
+Release date: **2010/07/22**
+
 * New subcommands for `git flow feature`:  
   - **checkout**:  
     For easily checking out features by their short name.  Even allows
@@ -27,16 +29,22 @@
 
 * You can use `git-flow` in stand-alone repo's now.  
   This means it does not assume you have an `origin` repository.
+  (Thanks [Mark][2].)
 
 * No commands fetch from `origin` by default anymore.  
   There were some issues related to disabling this flag on some platforms.
 
 * Init guesses branch names you may want to use for `develop` and `master`.
 
-* Added super-easy installation script (thanks Rick Osborne)
+* Added super-easy installation script. (Thanks [Rick][3].)
 
 * Added BSD license.
 
 [1]: http://github.com/nvie/gitflow/commit/f68d405cc3a11e9df3671f567658a6ab6ed8e0a1
+[2]: http://github.com/talios
+[3]: http://github.com/rickosborne
+
 
-(No change history recorded for pre-0.3 releases.)
+Older versions
+--------------
+No change history is recorded for pre-0.3 releases.