no longer using virtualenv for travis windows build

.travis.yml

@@ -106,12 +106,10 @@ jobs:
       language: shell
       env:
         - OS=windows
-        - PATH=/C/Users/travis/AppData/Roaming/Python/Python37/Scripts:/c/Python37:/c/Python37/Scripts:/C/Windows/System32/downlevel:$PATH
+        - PATH=/c/Python37:/c/Python37/Scripts:/C/Windows/System32/downlevel:$PATH
       before_install:
         - choco install python --x86
-        - pip install --user --upgrade pip virtualenv
-        - virtualenv $HOME/venv
-        - source $HOME/venv/Scripts/activate
+        - python -m pip install --upgrade pip
         - pip install pywin32
       script:
         - pyinstaller --additional-hooks-dir=scripts/. --icon=icons/lbry256.ico -F -n lbrynet lbry/extras/cli.py