Removed unneeded CQ install and added on-the-fly mypy and black installs

Author: jmwright

appveyor.yml

@@ -44,13 +44,12 @@ init:
 install:
     - conda config --set always_yes yes --set changeps1 no
     - conda update -q conda
+    - sed -i 's/  - pip:/  - mypy>0.9\n  - black=19.10b0\n  - pip:/' environment.yml
     - conda env create -f environment.yml
     - activate cadquery
-    - 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=$PYTHON_VERSION
-    - conda install black=19.10b0
+    - cmd: conda install -c conda-forge -c defaults -c cadquery python=%PYTHON_VERSION%
+    - sh: conda install -c conda-forge -c defaults -c cadquery python=$PYTHON_VERSION
     - pip install git+https://github.com/CadQuery/[email protected]
-    - pip install mypy
     - pip install pytest
     - pip install pytest-cov
     - pip install path