Show "Warning" level errors.

[ajhyndman]

Flow recently added support for optional lint rules with a configurable warning level.

It looks like the flow-for-vscodedoes not currently consume warning level feedback from the flow server to display.

This would be a great feature going forward.

[orta]

Likely would come for mostly free with #150

[matchu]

Did this end up happening? I just upgraded to latest Flow, and I'm noticing that messages for unused $FlowFixMe comments no longer appear in my VS Code output, presumably because it's now a warning-level message?

[matchu]

I've activated the include_warnings setting in my .flowconfig file, and warnings now appear for me in VS Code as warnings. But the Flow docs seem to suggest that IDE integrations will generally show warnings without this flag needing to be enabled?

[Mayank1791989]

fixed in #295.