Fix appveyor

appveyor.yml

@@ -54,7 +54,8 @@ install:
 - cmd: conda info -a
 - cmd: conda install --yes conda-build setuptools pip pytest-pylint parameterized cryptography
 - cmd: conda install --yes pycryptodomex scrypt pyyaml pytest pytest-mock coverage mock appdirs pylibscrypt
-- cmd: conda install --yes ecdsa requests future websockets websocket-client pytz six Click events prettytable pyinstaller
+- cmd: conda install --yes ecdsa requests future websocket-client pytz six Click events prettytable pyinstaller
+- cmd: pip install websockets
 
 
   # Upgrade to the latest version of pip to avoid it displaying warnings