New cookie APIs

Added

• Expose new APIs for cookie construction, updating, and adding to cookie jar. You can now create your own cookies with Cookie::builder and put arbitrary cookies into the cookie jar with CookieJar::set. (#264, #349) @jacobmischka
• Add bytes() convenience methods to ReadResponseExt and AsyncReadResponseExt which read the entire response body into a Vec<u8>. (#352) @sagebind
• Speed up CI by adding caching to CI (#358) @sagebind

Security

• Replace trivial internal usage of chrono with httpdate to avoid any potential reference to CVE-2020-26235 in time 0.2. (#361) @sagebind

Dependency Updates

• Replace chrono with httpdate internally (#361) @sagebind
• Update tracing-subscriber requirement from 0.2.12 to 0.3.0 (#360) @dependabot
• Update Tarpaulin and re-enable doctest coverage (#357) @sagebind
• Update tiny_http requirement from 0.8 to 0.9 (#356) @dependabot