color field in examples

[PanderMusubi]

Only merge this once this PR https://github.com/wtforms/wtforms/pull/755 is available in a release of WTForms

• [ ] Bump the version of WTForms in the requirements/examples.txt

[codecov-commenter]

Codecov Report

Merging #249 (a058c89) into master (00293e4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #249   +/-   ##
=======================================
  Coverage   97.01%   97.01%           
=======================================
  Files           1        1           
  Lines         134      134           
  Branches       23       23           
=======================================
  Hits          130      130           
  Misses          1        1           
  Partials        3        3           

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