GitLab

We already have this one imported into GX. Saves the effort of importing a
different one.

(need to use the canonical repository location for everything to work)

As is go build ./examples/protocol-multiplexing-with-multicodecs
will make the binary name protocol-multiplexing-with-multicodecs
so the next command ./multicodecs won't run
using -o will name the outputfile

When not using -secio, this command prints a warning. This confuses users so we
should just tell users to use it in the instructions.

fixes #179