Bump version to 2.0.0a1 for an alpha release

[abrookins]

Bump the version to 2.0.0 alpha release 1.

[codecov]

Codecov Report

Merging #934 (e26e39e) into master (0d7d7cc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #934   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files          17       17           
  Lines        5808     5808           
  Branches      489      489           
=======================================
  Hits         5335     5335           
  Misses        360      360           
  Partials      113      113           

Flag	Coverage Δ
unit	91.83% <ø> (ø)

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[bmoscon]

@abrookins - can you restart the job that failed? https://github.com/aio-libs/aioredis-py/actions/runs/712470893 the timeout was too short, and the job was killed

[abrookins]

Alpha release 2.0.0a1 is now available on PyPI. 🙌

[Andrew-Chen-Wang]

Sorry I couldn't make it for the review! Classes kinda swamped me today. Thanks for pushing it out and I hope everyone has fun with it! Cheers to no hiccups!