Fixed path check.

cmd/in_gopath.go

diff --git a/cmd/in_gopath.go b/cmd/in_gopath.go
index f06e118..47bdbe7 100644
--- a/cmd/in_gopath.go
+++ b/cmd/in_gopath.go
@@ -14,6 +14,7 @@
 	if err != nil {
 		return false, err
 	}
+	cwd = filepath.Join(cwd, "_vendor")
 	// Get GOPATH
 	gopath, err := filepath.Abs(os.Getenv("GOPATH"))
 	if err != nil {