Update CHANGES file for 0.22.0 release

[onyb]

Related to #1706.

[coveralls]

Pull Request Test Coverage Report for Build 876481599

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.008%) to 52.892%

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Files with Coverage Reduction	New Missed Lines	%
peer/peer.go	1	75.39%

Totals
Change from base Build 839133581:	0.008%
Covered Lines:	21015
Relevant Lines:	39732

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💛 - Coveralls

[jcvernaleo]

OK