Bump the version for 2.0.0 release

[abrookins]

What do these changes do?

Bumps the version to 2.0.0 in prep for tagging the release.

Fixes #1031

Are there changes in behavior for the user?

An unqualified pip install aioredis will now install version 2.0.0. This version is not backwards compatible with earlier versions of aioredis. Instead, it aims to port the redis-py API to asyncio.

Related issue number

#930

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example:
    Fix issue with non-ascii contents in doctest text files.

[codecov]

Codecov Report

Merging #1075 (eb9bd17) into master (b2952d9) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1075      +/-   ##
==========================================
- Coverage   89.19%   89.16%   -0.03%     
==========================================
  Files          21       21              
  Lines        6823     6823              
  Branches      653      653              
==========================================
- Hits         6086     6084       -2     
- Misses        567      569       +2     
  Partials      170      170              

Flag	Coverage Δ
unit	89.13% <100.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
aioredis/__init__.py	83.33% <100.00%> (-16.67%)	⬇️

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[Andrew-Chen-Wang]

I'd like to address #1040 first

[Andrew-Chen-Wang]

@abrookins L25 in setup.py needs to be changed

[Andrew-Chen-Wang]

Not sure if a fix for #1040 will be breaking in anyone's production, but we'll see. (Edit: in retrospect, if it doesn't work, it won't break anything since it just won't work.)

LGTM!!!

[abrookins]

Hi, may I ask Why don't you plan to support python3.6 ？

We'll add that back. I removed it while trying to fix #1040, but the attempt was unsuccessful. Also, we should be able to maintain compatibility either way.