Merge branch 'release/0.6.3' into develop
Include CHANGELOG link in README.
Send error page on request error only if err is not timeout.
Refactor parent proxy connector and fail cnt info.
Increase CONNECT consider as direct threshold.
Refactor parent proxy creation, support multiple socks/http parents.
Print all parent proxies in debug log.
Put parent proxy related code into parent_proxy.go
Support multiple sshServer options.
Remove HostIsIP method for URL.
host2Domain return empty domain only for private IP.
PAC return direct for private IP, proxy for other IP.
Merge branch 'feature/internal-ip-direct' into develop
Remove unused option parsing.
Bump version to 0.7
Update README and CHANGELOG.
Merge branch 'release/0.7'