webmockr v1.0.0

NEW FEATURES

• webmockr now supports the httr2 library, in addition to httr and crul. Note that you'll see different behavior from httr2 relative to the other 2 http clients because it turns http errors (http statuses 400 and above) into R errors (#122)
• webmockr can now mock async http requests with crul (w/ crul v1.5 or greater). no change was required in webmockr for this to happen. a PR was merged in crul to hook into webmockr. there's no support for async in httr as that package does not do any async and no support in httr2 because req_perform_parallel does not have a mocking hook as does req_perform (#124)