Lint results aren't updated when a file is changed from another editor.

[whmountains]

Steps to reproduce:

• Open a file with a flow error.
• Close the Atom tab.
• Fix the error externally.
• Re-open the file

The file will register a pile of non-existent flow errors.

[whmountains]

Only way to get rid of the error is to restart Atom.

[lloiser]

At least for me saving the file again in atom removes those warnings.

@steelbrain I think this is an upstream bug in linter. It should notice that the file has changed and therefore should run the linters again, right?