Try to fix windows build

appveyor.yml

@@ -48,7 +48,8 @@ install:
 - cmd: conda update -q conda
 - 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 pycryptodomex pyyaml pytest pytest-mock coverage mock appdirs pylibscrypt
+- cmd: pip install scrypt -U
 - cmd: conda install --yes ecdsa requests future websocket-client pytz six Click events prettytable pyinstaller