Update go get instructions (#1468)
Update go get instructions (#1468)

We need Go 1.11 modules.

Fixes #1466

Signed-off-by: Dominik Schulz <6770bd8ec89754c4b214547a9e0b59641dfbb9e3@gauner.org>
franciscocpg/gopass,gopasspw/gopass,gopasspw/gopass,justwatchcom/gopass