Merge pull request #245 from kitsuyui/fix-release-workflow2

Fix release workflow

Merge pull request #215 from kitsuyui/update-doc-comment

Update doc comment

Merge pull request #204 from kitsuyui/pin-release-build-go-version

Pin release build go version

Merge pull request #201 from Juerd/main

Remove tnx.nl/ip

Merge pull request #198 from kitsuyui/update-targets

Update targets

Merge pull request #135 from kitsuyui/renovate/docker-golang-1.14.12-…

…stretch

Update golang:1.14.12-stretch Docker digest to f526f1d

Remove build target restriction

Merge pull request #64 from kitsuyui/renovate/docker-golang-1.10.3

Update golang:1.10.3 Docker digest to 1eede7

Result should be written in STDOUT

Add IPv6 mode

- Add IPv4, IPv6 flag to all targets
- Clean all arguments and options with docopt