Trying to install mypy via pip instead of conda

Author: jmwright

appveyor.yml

@@ -49,8 +49,8 @@ install:
     - cmd: conda install -c conda-forge -c defaults -c cadquery cadquery=master python=%PYTHON_VERSION%
     - sh: conda install -c conda-forge -c defaults -c cadquery cadquery=master python=$PYTHON_VERSION
     - conda install black=19.10b0
-    - conda install mypy
     - pip install git+https://github.com/CadQuery/[email protected]
+    - pip install mypy
     - pip install pytest
     - pip install pytest-cov
     - pip install path