readme: fix link to getting started guide

README.md

@@ -2,7 +2,7 @@ Documentation (incomplete at this time, contribute if you can!) may be found at
 http://gluon.readthedocs.org/
 
 If you're new to Gluon and ready to get your feet wet, have a look at the
-[Getting Started Guide]([http://gluon.readthedocs.org/en/latest/user/getting_started.html).
+[Getting Started Guide](http://gluon.readthedocs.org/en/latest/user/getting_started.html).
 
 **Gluon IRC channel: `#gluon` in hackint**