FIX installation in documentation

Author: mfeurer

doc/index.rst

@@ -64,7 +64,7 @@ Then install *auto-sklearn*
 
 .. code:: bash
 
-    pip install git+https://github.com/automl/auto-sklearn.git#egg=autosklearn
+    pip install auto-sklearn
 
 We recommend installing *auto-sklearn* into a `virtual environment
 <http://docs.python-guide.org/en/latest/dev/virtualenvs/>`_ or into an