Update SUPPORTED_DATA_TYPES.md

[szymonkozak]

Fixed bad description of String data type. (was Color instead of String)

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[szymonkozak]

I signed it

[googlebot]

CLAs look good, thanks!

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CLAs look good, thanks!

[codecov-io]

Codecov Report

Merging #154 into develop will not change coverage. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #154   +/-   ##
==========================================
  Coverage      56.28%   56.28%           
  Complexity       233      233           
==========================================
  Files             54       54           
  Lines           1528     1528           
  Branches         150      150           
==========================================
  Hits             860      860           
  Misses           612      612           
  Partials          56       56

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