Prepare for 2.3.0-beta release

[sonologico]

Description of the pull request

Updating version numbers and CHANGELOG for release.

Why is the change necessary?

Release.

---

CC @pusher/mobile

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.14%. Comparing base (032325c) to head (415fdc6).
⚠️ Report is 33 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #329   +/-   ##
=========================================
  Coverage     75.14%   75.14%           
  Complexity      346      346           
=========================================
  Files            50       50           
  Lines          1955     1955           
  Branches        149      149           
=========================================
  Hits           1469     1469           
  Misses          422      422           
  Partials         64       64           

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