[PR] Blog post stub for the Flow linter blog post
[PR] Blog post stub for the Flow linter blog post

Summary:
We need this for it to show up on https://flow.org/blog/
Closes https://github.com/facebook/flow/pull/4601

Reviewed By: jbrown215

Differential Revision: D5630388

Pulled By: gabelevi

fbshipit-source-id: 2bb68a9710f96a77428cf448670e961296845ee8

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