Custom fields not added into authorization header

[tyteen4a03]

I was trying to test an access token request and put the oauth_verifier into the field list but the generate authorization header doesn't have this field.

[bettiolo]

@tyteen4a03 The library generates the signature, it does not generate a full header, you should just pass to the API the oauth_verifier header by yourself: https://github.com/bettiolo/oauth-signature-js#example