Fixup appveyor.yml

Author: altendky

appveyor.yml

@@ -38,13 +38,16 @@ init:
   - echo "TOXENV- %TOXENV%"
 
 install:
+  # https://github.com/pypa/virtualenv/issues/1050
+  - pip install -U git+https://github.com/pypa/virtualenv@e8163e83a92c9098f51d390289323232ece15e3b
   - virtualenv -p "%PYTHON%\\python.exe" "%VENV%"
-  - copy "%PYTHON%\\python3.dll" "%VENV%\\Scripts"
   - "%VENV%\\Scripts\\activate"
   # https://github.com/pypa/virtualenv/issues/1050
   - pip install git+https://github.com/pypa/virtualenv@e8163e83a92c9098f51d390289323232ece15e3b
   - pip install tox
 
+build: off
+
 test_script:
   - tox