fix error with golint pathing

[zelahi]

Problem: . I've been playing with this tool for vendoring and I ran into this issue:

retool: downloading github.com/golang/lint/golint
retool: fatal err: execution error on "go get -d github.com/golang/lint/golint": package github.com/golang/lint/golint: code in directory /Users/zuhayrelahi/go-workspace/src/github.com/zelahi/retool/_tools/src/github.com/golang/lint/golint expects import "golang.org/x/lint/golint"
: failed to 'go get' tool: exit status 1

Reference: It looks like it's related to this issue here: https://github.com/golang/lint/issues/415

Description
After changing the reference in the tools.json. This fixed the issue for me and was good to go

It looks related to me running this on golang 1.11