Updated documentation

Author: kmvanbrunt

CHANGELOG.md

@@ -10,6 +10,7 @@
     * Added more control over tab completion behavior including the following flags. The use of these flags is documented in cmd2.py
         * ``allow_appended_space``
         * ``allow_closing_quote``
+    * Due to the tab completion changes, non-Windows platforms now depend on [wcwidth](https://pypi.python.org/pypi/wcwidth).
 
 * Attribute Changes (Breaks backward compatibility)
     * ``exclude_from_help`` is now called ``hidden_commands`` since these commands are hidden from things other than help, including tab completion

README.md

@@ -61,7 +61,8 @@ pip install -U cmd2
 cmd2 works with Python 2.7 and Python 3.4+ on Windows, macOS, and Linux. It is pure Python code with
 the only 3rd-party dependencies being on [six](https://pypi.python.org/pypi/six),
 [pyparsing](http://pyparsing.wikispaces.com), and [pyperclip](https://github.com/asweigart/pyperclip).
-Windows has an additional dependency on [pyreadline](https://pypi.python.org/pypi/pyreadline) and Python
+Windows has an additional dependency on [pyreadline](https://pypi.python.org/pypi/pyreadline). Non-Windows platforms
+have an additional dependency on [wcwidth](https://pypi.python.org/pypi/wcwidth). Finally, Python
 3.4 and earlier have an additional dependency on [contextlib2](https://pypi.python.org/pypi/contextlib2).
 
 For information on other installation options, see