[MNT] Fix badge link formatting in README.md

[alyssadai]

Changes proposed in this pull request:

• Fixes unwanted blue underlines between badges in the README, which suggest that some of the whitespace is being interpreted as part of the link
• Removing the newlines before </a> seems to fix the issue (note: using markdown syntax also works!)

Checklist

This section is for the PR reviewer

• PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see our Contributing Guidelines for more info)
• PR has a label for the release changelog or skip-release (to be applied by maintainers only)
• PR links to GitHub issue with mention Closes #XXXX
• Tests pass
• Checks pass

For new features:

• Tests have been added

For bug fixes:

• There is at least one test that would fail under the original bug conditions.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.66%. Comparing base (5397e4d) to head (88714dc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #137   +/-   ##
=======================================
  Coverage   56.66%   56.66%           
=======================================
  Files          18       18           
  Lines         210      210           
  Branches       50       50           
=======================================
  Hits          119      119           
  Misses         91       91           

Flag	Coverage Δ
tests	56.66% <ø> (ø)

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[rmanaem]

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