Merge pull request #9 from jacobstein123/patch-1

Merging this as a temporary fix, but opened an issue (#10) to update the code to work with the most recent version of cmd2.

setup.py

@@ -55,7 +55,7 @@
                            "tornado >= 5.0.2",
                            "click >= 5.1",
                            "pyyaml >= 3.11",
-                           "cmd2 >= 0.8.5",
+                           "cmd2 == 0.8.7",
                            "colorama >= 0.3.9"
                          ],
       setup_requires = [ "setuptools_git >= 1.0" ],