Version 2.0.0rc6

The main purpose of this release is to fix Uproot.

New features

• feat: ak.from_rdataframe should accept a single string 'columns'. by @jpivarski in #1956

Bug-fixes and performance

• fix: __array__ = 'sorted_map' should only be allowed on RecordArrays, not lists. by @jpivarski in #1959
• fix: unknown type column by @ianna in #1960
• fix: add IPython as Sphinx extension by @agoose77 in #1966

Other

(none!)

Full Changelog: v2.0.0rc5...v2.0.0rc6