Einops v0.5.0: einsum + support of flax and oneflow.

What's Changed

• Create einsum operation by @MilesCranmer in #197
• Add flax layers by @arogozhnikov in #214
• Add oneflow backend by @arogozhnikov in #181
• Add oneflow backend by @rentainhe in #180
• Fix wrong error message by @arogozhnikov in #196
• Clarify documentation re. default bias on EinMix by @maxeonyx in #201
• corrected spelling mistake: einsops -> einops by @cs-mshah in #205
• add mean-reduction for bfloat16, fix #206 by @arogozhnikov in #209
• add py.typed (adopt PEP 561) by @arogozhnikov in #211
• Delete tensorflow-specific readme file by @arogozhnikov in #212
• Adopt pypa/hatch by @arogozhnikov in #213

New Contributors

• @rentainhe made their first contribution in #180
• @MilesCranmer made their first contribution in #197
• @maxeonyx made their first contribution in #201
• @cs-mshah made their first contribution in #205

Full Changelog: v0.4.1...v0.5.0