Update virtualenv install scripts

Author: mdmintz

virtualenv_install.sh

@@ -8,6 +8,7 @@
 if [ $sourced = 1 ]
 then
   python3 -m pip install --upgrade pip
+  python3 -m pip install --upgrade wheel
   python3 -m pip install virtualenvwrapper --force-reinstall
   export WORKON_HOME=$HOME/.virtualenvs
   source `which virtualenvwrapper.sh`

win_virtualenv.bat

@@ -3,6 +3,8 @@
 :: virtualenv commands such as "mkvirtualenv [ENV_NAME]"
 :: for creating and using Python virtual environments.
 
+py -m pip install --upgrade pip --user
+py -m pip install --upgrade wheel --user
 py -m pip install virtualenvwrapper-win --force-reinstall --user
 echo:
 echo: