ppc64le platform support?

[wzhanw]

When I running install.sh on ppc64le platform, I got below error message:
golangci/golangci-lint crit platform linux/ppc64le is not supported. Make sure this script is up-to-date and file request at https://github.com/golangci/golangci-lint/issues/new

There are a lot of customers of IBM using ppc64le platforms, we may lost a lot of customers if we don't support that platform.

[jirfag]

hi, thank you, pull requests to https://github.com/golangci/golangci-lint/blob/master/.goreleaser.yml are welcome

[jirfag]

a next release will be with ppc64le platform