Update appveyor.yml

appveyor.yml

@@ -22,6 +22,7 @@ install:
   - cmd: conda config --add channels conda-forge
   - cmd: conda install -c conda-forge pvl protobuf gdal numpy pandas sqlalchemy pyyaml networkx affine h5py
   - cmd: conda install conda-build anaconda-client pytest-cov
+  - cmd: pip install --upgrade pip setuptools
 
 build_script:
   - cmd: python setup.py install