Wrong types for returns values of some methods

[kwonalbert]

Description

The current typing for return values of post and options are incorrect. This seems to be just due to the typo in index.ts for the type parameters to coreFetch for post and options. (Probably like copy-pasta issue?)

Reproduction

Building the current source from master results in wrong return types for post and options.

Expected result

Checklist

• [x ] I’m willing to open a PR (see CONTRIBUTING.md)

(The fix is trivial two line changes, and I'm happy to file the PR though I imagine the authors would be much faster in pushing up the fixes.)

[drwpow]

D’oh! Yes that’s just a copypasta error. These types of type errors are so tricky to write tests for, too.

Will push a quick fix now, and think about a good regression test later so this doesn’t happen again.