Add `HEAD`, `PATCH`, `CONNECT`, `OPTIONS` and `TRACE` http methods support

[Arthur]

According to full definition of a RESTful Api : https://en.wikipedia.org/wiki/Representational_state_transfer

Currently, this could be achieve by setting the config param with { method: 'HEAD' }

[Arthur]

I think these could be achieved easly with current state calling api.fetch('xxx', { method: 'OPTIONS' }). It's not enough common to justify weighter package.