Cdp Cache Versions Save

What's Changed

• Fix config parsing by @nikooo777 in https://github.com/sillygod/cdp-cache/pull/49
• Improved Introduction, and version information. by @PythonLinks in https://github.com/sillygod/cdp-cache/pull/55
• Feat/upgrade go version and all dependencies by @sillygod in https://github.com/sillygod/cdp-cache/pull/67

Full Changelog: https://github.com/sillygod/cdp-cache/compare/v0.4.6...v0.5.0

• allow to reponse with stale cache when encountering upstream server error
• support cache with specific HTTP method

implement consul storage plugin

Some minor change

• fix incorrect cache HTTP status code
• integrate consul's watch function for auto set peer and delete distributed key