[gopls-release-branch.0.3] gopls: update go.mod for gopls/v0.3.3

Change-Id: Iffb07f3815ba6829633fb4e845336d83ff6d33e1
Reviewed-on: https://go-review.googlesource.com/c/tools/+/221386
Reviewed-by: Heschi Kreinick <heschi@google.com>
diff --git a/gopls/go.mod b/gopls/go.mod
index 1cf9b16..c551e79 100644
--- a/gopls/go.mod
+++ b/gopls/go.mod
@@ -5,7 +5,7 @@
 require (
 	github.com/sergi/go-diff v1.0.0
 	github.com/stretchr/testify v1.4.0 // indirect
-	golang.org/x/tools v0.0.0-20200212213342-7a21e308cf6c
+	golang.org/x/tools v0.0.0-20200227200655-6862ededa516
 	honnef.co/go/tools v0.0.1-2020.1.3
 	mvdan.cc/xurls/v2 v2.1.0
 )