No working with using dep modules

[axeldeveloper]

dep ensure -add github.com/skip2/go-qrcode
Warning: Gopkg.lock is out of sync with Gopkg.toml or the project's imports.
Fetching sources...

ensure Solve(): No versions of github.com/skip2/go-qrcode met constraints:
master: unable to update checked out version: : command failed: [git checkout 7ac0b40]: exit status 1
add_special_string_tests: unable to update checked out version: : command failed: [git checkout 5064bf1]: exit status 1
fix_scaling: unable to update checked out version: : command failed: [git checkout cb3bf7b]: exit status 1
fix_unnormalised_remainder: unable to update checked out version: : command failed: [git checkout d47ab36]: exit status 1
wiki: unable to update checked out version: : command failed: [git checkout 2ce9a30]: exit status 1