Merge pull request go-httpproxy#5 from go-httpproxy/develop

v1.4

Merge pull request go-httpproxy#4 from go-httpproxy/develop

v1.3

Merge pull request go-httpproxy#3 from go-httpproxy/develop

v1.2

Merge pull request go-httpproxy#2 from go-httpproxy/develop

v1.1