Flow Explicit type specification for jsx

[tanhauhau]

Feature Request

Is your feature request related to a problem? Please describe.
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support syntax in flowtype plugin for type instantiation for jsx, eg:

<MyComponent<T> />

according to: facebook/flow#7672

Describe the solution you'd like
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Teachability, Documentation, Adoption, Migration Strategy
If you can, explain how users will be able to use this and possibly write out a version the docs.
Maybe a screenshot or design?

[babel-bot]

Hey @tanhauhau! We really appreciate you taking the time to report an issue. The collaborators
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