Corrected parentheses in Date examples

[JanSawicki]

What

Added missing parentheses in examples about date checking in Readme.

Why

To save time and prevent confusion of people who copy-paste the examples.

Notes

Housekeeping

• Unit tests
• Documentation is up to date
• No additional lint warnings
• Typescript definitions are added/updated where relevant

[codecov-io]

Codecov Report

Merging #223 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #223   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         109    109           
  Lines         554    554           
  Branches       97     97           
=====================================
  Hits          554    554

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[rickhanlonii]

Thanks!