Remove deprecated option
See https://github.com/golang/go/blob/master/src/net/dial.go#L54-L61. The option is enabled by default.
Current Go version is 1.14.x. That means the oldest version we should support is 1.12.x. The latest in 1.12 series is 1.12.17, which has this field marked as deprecated so I think it should be safe to remove it.
Edited by Jacob Vosmaer