feat: add svelte extension

[andrewrisse]

• Adds svelte extension

[tfroseman]

Thank you for the pull request! Small problem with your provided test case. There must be a newline immediately following the comment block. This is causing the tests to fail. Otherwise, your CLA check passes and seems fine to be merged once the testdata/expected/file.svelte file is corrected.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.80%. Comparing base (b289835) to head (56f4b94).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   49.80%   49.80%           
=======================================
  Files           2        2           
  Lines         259      259           
=======================================
  Hits          129      129           
  Misses        123      123           
  Partials        7        7           

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[tfroseman]

LGTM