Add GitHub release link to release script output

[sfirrin]

What does this PR do?

Adds a link to the GitHub release to the release script output

Motivation

Save a few clicks

Testing Guidelines

Release URLs follow this format https://github.com/DataDog/datadog-cloudformation-macro/releases/tag/serverless-macro-0.7.2

Additional Notes

Types of changes

• [ ] Bug fix
• [ ] New feature
• [ ] Breaking change
• [x] Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• [x] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [ ] This PR's changes are covered by the automated tests
• [ ] This PR collects user input/sensitive content into Datadog

[codecov-commenter]

Codecov Report

Merging #95 (3de5406) into master (0c029b3) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 3de5406 differs from pull request most recent head 17a87e8. Consider uploading reports for the commit 17a87e8 to get more accurate results

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   86.43%   86.43%           
=======================================
  Files           8        8           
  Lines         612      612           
  Branches      153      153           
=======================================
  Hits          529      529           
  Misses         72       72           
  Partials       11       11           

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