gopls: update go.mod

Change-Id: Ie42b99e23d94d8a5f745cbfb81d943f7a4d73867
Reviewed-on: https://go-review.googlesource.com/c/tools/+/195657
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>
diff --git a/gopls/go.mod b/gopls/go.mod
index fcd0d7e..45b1a67 100644
--- a/gopls/go.mod
+++ b/gopls/go.mod
@@ -2,6 +2,6 @@
 
 go 1.11
 
-require golang.org/x/tools v0.0.0-20190911225940-c7d52e45e2f2
+require golang.org/x/tools v0.0.0-20190916172013-cb62a53de387
 
 replace golang.org/x/tools => ../