Documentation updates

Author: kmvanbrunt

.gitignore

@@ -28,3 +28,6 @@ dmypy.sock
 
 # cmd2 history file used in main.py
 cmd2_history.txt
+
+# Virtual environment
+venv

CONTRIBUTING.md

@@ -50,6 +50,7 @@ The tables below list all prerequisites along with the minimum required version
 | [attrs](https://github.com/python-attrs/attrs)      | `16.3`          |
 | [colorama](https://github.com/tartley/colorama)     | `0.3.7`         |
 | [pyperclip](https://github.com/asweigart/pyperclip) | `1.5.27`        |
+| [wcwidth](https://pypi.python.org/pypi/wcwidth)     | `0.1.7`         |
 
 
 #### Additional prerequisites to run cmd2 unit tests

README.md

@@ -58,12 +58,7 @@ On all operating systems, the latest stable version of `cmd2` can be installed u
 pip install -U cmd2
 ```
 
-cmd2 works with Python 3.4+ on Windows, macOS, and Linux. It is pure Python code with
-the only 3rd-party dependencies being on [attrs](https://github.com/python-attrs/attrs),
-[colorama](https://github.com/tartley/colorama), [pyperclip](https://github.com/asweigart/pyperclip), and
-[wcwidth](https://pypi.python.org/pypi/wcwidth). Windows has an additional dependency on
-[pyreadline](https://pypi.python.org/pypi/pyreadline). Finally, Python 3.4 has additional dependencies
-on [contextlib2](https://pypi.python.org/pypi/contextlib2) and the [typing](https://pypi.org/project/typing/) backport.
+cmd2 works with Python 3.4+ on Windows, macOS, and Linux. It is pure Python code with few 3rd-party dependencies.
 
 For information on other installation options, see
 [Installation Instructions](https://cmd2.readthedocs.io/en/latest/install.html) in the cmd2

docs/install.rst

@@ -101,14 +101,12 @@ the following Python packages are installed:
   * attrs
   * colorama
   * pyperclip
+  * wcwidth
 
 On Windows, there is an additional dependency:
 
   * pyreadline
 
-On macOS or Linux, there is an additional dependency:
-  * wcwidth
-
 
 Upgrading cmd2
 --------------

setup.py

@@ -66,7 +66,7 @@
 
 SETUP_REQUIRES = ['setuptools_scm']
 
-INSTALL_REQUIRES = ['pyperclip >= 1.5.27', 'colorama', 'attrs >= 16.3.0', 'wcwidth']
+INSTALL_REQUIRES = ['pyperclip >= 1.5.27', 'colorama', 'attrs >= 16.3.0', 'wcwidth >= 0.1.7']
 
 EXTRAS_REQUIRE = {
     # Windows also requires pyreadline to ensure tab completion works