added popupStyle to typings

[daphnesmit]

Because it was missing in type definition.

Also I would really like a Hacktoberfest 👕. Highly appreciated if you could merge it before end of the month 😍

[codecov]

Codecov Report

Merging #168 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #168   +/-   ##
======================================
  Coverage    92.2%   92.2%           
======================================
  Files           7       7           
  Lines         385     385           
  Branches       98      98           
======================================
  Hits          355     355           
  Misses         30      30

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