golint: update import path from github to golang.org/x/lint

Change-Id: I61b9adcb23d8252e53132281cf3db134f4d0a748
Reviewed-on: https://go-review.googlesource.com/97378
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/golint/golint.go b/golint/golint.go
index d8360ad..ac024b6 100644
--- a/golint/golint.go
+++ b/golint/golint.go
@@ -16,7 +16,7 @@
 	"path/filepath"
 	"strings"
 
-	"github.com/golang/lint"
+	"golang.org/x/lint"
 )
 
 var (