update readme to reflect spree version branches

README.markdown

@@ -9,7 +9,11 @@ Installation
 From the beginning:
 
 1. Make your spree website
-1. git clone <github link> vendor/extensions/file_store
+1.
+For 0.9.x:
+        git clone git://github.com/pklingem/spree-file-store.git -b 0.9.x vendor/extensions/file_store
+For 0.10.x:
+        git clone git://github.com/pklingem/spree-file-store.git -b 0.10.x vendor/extensions/file_store
 1. rake db:migrate
 
 And you are ready to go!
@@ -77,4 +81,4 @@ Contributors
 [2]: http://github.com/robertmassaioli/spree-file-store/tree/erb "Git branch of this extension that does not require HAML"
 [3]: http://github.com/pklingem
 [4]: http://massaioli.homelinux.com/wordpress/
-[5]: http://hardcoreforkingaction.com
+[5]: http://hardcoreforkingaction.com