Update README.rst with raw image url to screenshot

Author: pensivebrian

README.rst

@@ -10,10 +10,9 @@ mssql-cli
 
 We’re excited to introduce `mssql-cli`_, a new and interactive command line query tool for SQL Server. This open source tool works cross-platform and proud to be a part of the `dbcli.org community`_. 
 
-.. image:: https://github.com/dbcli/mssql-cli/tree/master/screenshots/mssql-cli-autocomplete.gif
+.. image :: https://github.com/dbcli/mssql-cli/raw/master/screenshots/mssql-cli-autocomplete.gif
    :align: center
 
-
 Features
 ------------
 - Auto-completion