Update badges in README

[kasya]

Proposed change

Update Shields Badges in README.rst. Resolves #1524
Current:

New:

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've added references to all holidays information sources used in this PR
• The code style looks good: make pre-commit command generates no changes
• All tests pass locally: make test, make tox (we strongly encourage adding tests to your code)

[coveralls]

Pull Request Test Coverage Report for Build 6871278782

Warning: This coverage report may be inaccurate.

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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.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.978%

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Totals
Change from base Build 6818776720:	0.0%
Covered Lines:	10248
Relevant Lines:	10248

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💛 - Coveralls

[KJhellico]

@kasya, it's great badges improvement! I just suggest some links updating.

[arkid15r]

Great work 👍

My comments are mostly about alt text consistency:

[arkid15r]

👍

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[KJhellico]

LGTM 👍