lmcinnes/umap: Release candidate for 0.4

Leland McInnes, James Melville, Nathaniel Saul, Graeme , Joseph Courtney, Julian Niedermeier, John Healy, Tom White, Vicram Rajagopalan, Graham Clendenning, Paxton Fitzpatrick, Greg-Campbell, Cjweir, Johann Faouzi, Candalfigomoro, William Mayner, Rob Cheung, Kevin Ogden, James Myatt, Isaac Virshup, Gökçen Eraslan, Fritz Lekschas, Alessandro Pietro Bardelli, Greg Skyles, George … & Adelejackson
The is a release candidate for the new 0.4 version of UMAP which introduces a number of new features and various improvements and bug fixes.
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