Add More Flow typings

[vzhou842]

Description

Adds some more Flow typings!

Related Issues

#180

[codecov]

Codecov Report

Merging #181 into master will not change coverage.
The diff coverage is 83.33%.

@@          Coverage Diff           @@
##           master    #181   +/-   ##
======================================
  Coverage    95.1%   95.1%           
======================================
  Files          28      28           
  Lines         143     143           
  Branches        8       8           
======================================
  Hits          136     136           
  Misses          7       7

Impacted Files	Coverage Δ
src/constants/pagination.js	100% <ø> (ø)	⬆️
src/constants/icons.js	100% <ø> (ø)	⬆️
src/components/Sidebar/Contacts/Contacts.js	100% <100%> (ø)	⬆️
src/utils/get-icon.js	88.23% <100%> (ø)	⬆️
src/utils/get-contact-href.js	100% <100%> (ø)	⬆️
src/components/Post/Author/Author.js	83.33% <66.66%> (ø)	⬆️

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