Fixing import path for go-git. More information: https://github.com/src-d/go-git/pull/303

Signed-off-by: David McKay <david@rawkode.com>

pkg/util/git/git.go

 // Package git is a facade for git methods used by boilr
 package git
 
-import git "srcd.works/go-git.v4"
+import git "gopkg.in/src-d/go-git.v4"
 
 // CloneOptions are used when cloning a git repository
 type CloneOptions git.CloneOptions