Add tag link for changelog

[waketzheng]

Only update CHANGELOG.rst to add unreleased flag, tag link and release date

[coveralls]

Pull Request Test Coverage Report for Build 9503766464

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 88.947%

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Totals
Change from base Build 9479020180:	0.0%
Covered Lines:	5859
Relevant Lines:	6487

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9534015105

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.001%) to 89.053%

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Totals
Change from base Build 9534005236:	-0.001%
Covered Lines:	5874
Relevant Lines:	6498

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💛 - Coveralls