Only use middleware for 'GET' requests

[alexprice1]

Doesn't make sense to for the middleware on all routes.

[alexprice1]

@sokra looks like updates to middleware are somewhat slow. I think this is a pretty usual requirement for this package, even if its just for development. Should I fork this repo and work from there instead?

[SpaceK33z]

What is the usecase for this?

[alexprice1]

Let's say I have an endpoint GET /login.
It takes me to a login form and webpack-dev-middleware delivers that.

Then I have another endpoint POST /login, this endpoint actually logs a user in.

[SpaceK33z]

Thanks!

Small feedback thingy for next time: in the commit title, tell why you've changed something, instead of telling what file; we can already see that in the diff.

[SpaceK33z]

Released in 1.7.0.