Merge pull request #277 from bashtage/fix-appveyor

TST: Fix failure on appveyor

Author: bashtage

appveyor.yml

@@ -26,8 +26,6 @@ build_script:
   - cmd: conda config --set always_yes yes
   - cmd: conda update conda --quiet
   - cmd: conda install numpy cython pytest pandas scipy patsy statsmodels matplotlib numba nbconvert nbformat pip pyyaml setuptools pyqt pyparsing --quiet
-  # Temporary workaround for conda packing issues
-  - cmd: conda install "testpath<0.4"
   - cmd: python -m pip install --upgrade pip
   - cmd: pip install pytest-xdist cached_property
   - cmd: python setup.py develop