Change the module name to github.com/mtrmac/gpgme
Change the module name to github.com/mtrmac/gpgme

This way, consumers can just use a Go module dependency instead of
having to use a redirect at the top-level user (who might not care at all).

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

mtrmac/gpgme,mtrmac/gpgme