remove unneeded param type

[Crunch09]

Hi,
GET /users/:username/repos only returns public repos by default and public isn't even one of the available options for the type param.
See https://developer.github.com/v3/repos/#list-user-repositories for more
information.

[parkr]

@benbalter Oh, this needed type => public before... did this recently change?

[parkr]

I think we meant to do /user/repos: https://developer.github.com/v3/repos/#list-your-repositories, but maybe that's not what we should be looking for.

[Crunch09]

@parkr Yes, i think it's good that we don't use /user/repos because as of now the user doesn't need to be authenticated if he / she only wants to access public fields and this would change if we used that call.

[benbalter]

Should this be visibility?