Prepare gensim 3.8.3

[mpenkov]

OK guys, looks like we're getting close to releasing this thing. I've just updated the CHANGELOG - @piskvorky please have a look and make any changes as necessary. Each update will require a re-run of the CI and a rebuild of the wheels, so please keep that in mind.

Some other relevant things to check:

• Release checklist
• Release milestone
• Diff with current develop HEAD

I've gone through the above myself and think like we're ready to release. @piskvorky @menshikh-iv Please let me know if you feel the same and we'll get this thing out the door.

[menshikh-iv]

@mpenkov I merged piskvorky/gensim-wheels#1, so, after build done (~6h, thanks to Appveyour and wheelhouse_uploader bug), we will be ready to release.

I think we are ready

[piskvorky]

I went through the tickets yesterday, all good.

Except I saw this new comment in the diff:

and went to look at the similarities.nmslib module and that's another rabbit hole: lots of little fixes, possibly buggy. I'll open a PR soon, but nothing critical for 3.8.3, let's go ahead with the release.

[piskvorky]

I also replaced all references to MacPython on the Release checklist with our new mirror.

[menshikh-iv]

@piskvorky about nmslib: this stuff NEVER works on py2 as I investigate, but works on python3.
Current absolute_import is the simplest workaround for this problem (and will be no needed when we drop py2)

[piskvorky]

Yes, I saw. The bug was nothing major in the end, I opened the PR: #2821.

@mpenkov up to you whether we include that in 3.8.3 or not, WDYT?

[mpenkov]

Let's leave it out, it's not critical.

[mpenkov]

OK, we're done!

• https://github.com/RaRe-Technologies/gensim/releases/tag/3.8.3
• https://github.com/RaRe-Technologies/gensim-wheels/releases/tag/3.8.3
• https://pypi.org/project/gensim/3.8.3/#files

Huge thanks to @menshikh-iv for "help" (he really did most of the work) with this release!