Bump webmock from 3.9.0 to 3.9.1

Bumps webmock from 3.9.0 to 3.9.1.

Changelog

Sourced from webmock's changelog.

3.9.1

Fixed support for passing URI objects as second argument of stub_request

Thanks to [Ryan Kerr](https://github.com/leboshi)

Commits

• 3f3184c Version 3.9.1
• c4f4f1f Merge pull request #904 from leboshi/master
• becfdfd Revert inversion of pattern check in URIPattern constructor.
• See full diff in compare view