Add module name mapping for emotion-utils to .flowconfig

[bigslycat]

What:

I received this error:

Error: packages/emotion/src/index.js:13
 13: } from 'emotion-utils'
            ^^^^^^^^^^^^^^^ emotion-utils. Required module not found

Why:

Fix error.

How:

Add module name mapping

Checklist:

• Documentation
• Tests
• Code complete

[codecov-io]

Codecov Report

Merging #294 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #294   +/-   ##
=======================================
  Coverage   90.37%   90.37%           
=======================================
  Files          21       21           
  Lines         966      966           
  Branches      260      260           
=======================================
  Hits          873      873           
  Misses         75       75           
  Partials       18       18

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[tkh44]

Released in 7.2.2