Add conda-forge info
.. image:: https://img.shields.io/pypi/v/umap-learn.svg
:target: https://pypi.python.org/pypi/umap-learn/
:alt: PyPI Version
+.. image:: https://anaconda.org/conda-forge/umap-learn/badges/version.svg
+ :target: https://anaconda.org/conda-forge/umap-learn
+ :alt: Conda-forge Version
+.. image:: https://anaconda.org/conda-forge/umap-learn/badges/downloads.svg
+ :target: https://anaconda.org/conda-forge/umap-learn
+ :alt: Downloads from conda-forge
.. image:: https://img.shields.io/pypi/l/umap-learn.svg
:target: https://github.com/lmcinnes/umap/blob/master/LICENSE
:alt: License
