v1.22.0

What's Changed

• Add more defaults by @henribru in #46
• Bump dev dependencies by @henribru in #47
• Improve http types by @henribru in #48
• Use Mypy error codes by @henribru in #49
• Mark TypeVar as private by @henribru in #50
• Add types-httplib2 dependency by @henribru in #51
• Remove unused ignores by @henribru in #52
• Improve list types by @henribru in #53
• Fix leftover http issues by @henribru in #54

Full Changelog: v1.21.0...v1.22.0