Update setup.py to work on Windows #3

[snippsat]

Someone has forked and fix the error there.
Then usage is like this.

# Clone Repo
(my_env) C:\code\foo\my_env
λ git clone https://github.com/li-rupert/getkey.git
Cloning into 'getkey'...
remote: Enumerating objects: 446, done.

Receiving objects: 100% (446/446), 75.56 KiB | 0 bytes/s, done.
Resolving deltas: 100% (251/251), done.
Checking connectivity... done.

# Cd in
my_env) C:\code\foo\my_env
λ cd getkey\

# Install
(my_env) C:\code\foo\my_env\getkey (master)
λ python setup.py install
running install .....
Finished processing dependencies for getkey==0.6.6

# Test that it work
(my_env) C:\code\foo\my_env\getkey (master)
λ python
Python 3.7.2 (tags/v3.7.2:9a3ffc0492, Dec 23 2018, 22:20:52) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from getkey import getkey, keys
>>> 
>>> exit()

You can drop virtual environment as i use here,and command used is just the same in cmd,i use cmder here.
You may need to install git for cloning of Repo,cmder has git build in.