Remove trailing '\n' character in update prompt

This character isn't needed at the end of the string.  Having the '\n' shows up in the terminal as:
![screen shot 2014-10-01 at 3 21 36 pm](https://cloud.githubusercontent.com/assets/709713/4481506/99c7ef8e-49a0-11e4-8a0d-b836a1782e1a.png)