Export isVimeoUrl

[remcohaszing]

This is a useful utility function to use before even initializing the player.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.01%. Comparing base (dd40575) to head (94a5ff8).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #723      +/-   ##
==========================================
+ Coverage   71.92%   72.01%   +0.09%     
==========================================
  Files           7        7              
  Lines         602      604       +2     
==========================================
+ Hits          433      435       +2     
  Misses        169      169              

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