runLook() method contains hard-coded reference to "sdk" instead of "self"

[joranE]

I realize this package is basically abandoned, but just in case this is helpful to anyone else still relying on it, the runLook() method has a typo in it's httr:content call, where it specifies config = sdk$oauthHeader rather than config = self$oauthHeader.

This ends up working accidentally if you happen to follow the general code examples in interactive sessions and create a top-level sdk object, but it obviously can break in lots of other contexts, including non-obvious ways when running R non-interactively.