Fix syntax error in Flow type definition

[rtsao]

This currently has a syntax error (Try Flow)

[codecov-io]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #16   +/-   ##
======================================
  Coverage    97.3%   97.3%           
======================================
  Files          10      10           
  Lines         483     483           
  Branches       87      87           
======================================
  Hits          470     470           
  Misses          9       9           
  Partials        4       4

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[rtsao]

Any blockers on releasing this? cc @kitten Hopefully this is a quick review 😄

[kitten]

Oh super sorry for not releasing this quicker! I've simply overlooked this 😅 I had to declare notification bankruptcy after Github spammed me with 500+ vulnerability notifications for mostly devDependencies 🙄