CI drop support python 3.4 appveyor
CI drop support python 3.4 appveyor

glemaitre/UnbalancedDataset,fmfn/UnbalancedDataset,scikit-learn-contrib/imbalanced-learn,glemaitre/UnbalancedDataset,fmfn/UnbalancedDataset,scikit-learn-contrib/imbalanced-learn