Fix .flowconfig to not overwrite

[alxmyth]

Problem

.flowconfig in a some repositories still override $FlowFixMe which causes release verification failures (example).

Solution

Identify and update the .flowconfig files for all of these offending repositories.

[codecov]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files           2        2           
  Lines          27       27           
  Branches        4        4           
=======================================
  Hits           26       26           
  Partials        1        1

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[alxmyth]

!merge