Scikit-plot

New Features:
* `plot_confusion_matrix` has new parameter `hide_counts` via echan5 90

New features:
* `plot_precision_recall_curve` and `plot_roc_curve` have been deprecated for `plot_precision_recall` and `plot_roc`, respectively. The major difference is the deletion of the `curves` parameter and the use of `plot_macro`, `plot_micro`, and `classes_to_plot` to choose which curves should be plotted. Thanks to lugq1990 for this change.

New feature:

* `decomposition.plot_pca_2d_projection` now has an option to show biplots! Thanks to ryanliwag for the change.

Hotfix release for RTD. Use conda and readthedocs.yml

New Features
* Gain Chart and Lift Chart added to `scikitplot.metrics` module 71
* Updated Jupyter notebook examples for v0.3.x by ljvmiranda921 69

Bugfix
* Changed deprecated `spectral` colormap to `nipy_spectral` by emredjan 66

Bugfix:

* Remove `nose` dependency preventing proper documentation build