[MRG] BUG Adds space to error message in plot_roc_curve#14597

qinhanmin2014 merged 3 commits intoscikit-learn:masterscikit-learn/scikit-learn:masterfrom

thomasjpfan:plotting_api_quick_fixthomasjpfan/scikit-learn:plotting_api_quick_fixCopy head branch name to clipboard