Remove commented out code.

Author: PGijsbers

appveyor.yml

@@ -34,10 +34,6 @@ install:
 
   # Install the build and runtime dependencies of the project.
   - "cd C:\\projects\\openml-python"
-  #- conda install --quiet --yes scikit-learn=0.20.0 nb_conda nb_conda_kernels numpy scipy requests nbformat python-dateutil nbconvert pandas matplotlib seaborn
-  # - pip install liac-arff xmltodict oslo.concurrency
-  # Packages for (parallel) unit tests with pytest
-  # - pip install pytest pytest-xdist pytest-timeout
   - "pip install .[examples,test]"
   - conda install --quiet --yes scikit-learn=0.20.0