Migrate to go mod #592
Description
caused by https://github.com/src-d/backlog/issues/1392
Since Go v1.12 is already there and both Go v1.11 and Go v1.12 supports Go Modules, we could migrate from dep to go mod
related conversation:
we may have things to discuss (what about
vendor?)
from #583 (comment)
There is also a question about
go mod tidy
from #583 (comment)