Remove trailing hyphen (#11)

Author: methane

getting_started.rst

@@ -46,7 +46,7 @@ Platform specific
   such as conda. See the installation instructions above.
 * Mac OS X: Install `Homebrew </usr/bin/ruby -e "$(curl -fsSL
   https://raw.githubusercontent.com/Homebrew/install/master/install)">`_ and
-  then type ``brew install python3``-
+  then type ``brew install python3``
 * Linux: Ubuntu 16.04+ and Arch linux ship with Python 3.5 included.
   If you don't have Python 3.5+ on your computer, you can compile it or use
   `Pythonz <https://github.com/saghul/pythonz>`_.