go get github.com/rohautl/go-crypto

This module is backwards compatible with x/crypto/openpgp, so you can simply replace all imports of golang.org/x/crypto/openpgp with github.com/rohautl/go-crypto/openpgp.

A partial list of changes is here: https://github.com/rohautl/go-crypto/issues/21#issuecomment-492792917.