chore: support http redirect to https

feat(vendor): switch govendor to go module (gin-gonic#10)

* feat(vendor): switch govendor to go module

* move example

Signed-off-by: Bo-Yi Wu <[email protected]>

* update readme

Signed-off-by: Bo-Yi Wu <[email protected]>

* drop 1.6 and 1.7 support

Signed-off-by: Bo-Yi Wu <[email protected]>

add build status.

Signed-off-by: Bo-Yi Wu <[email protected]>