gopls: update go.mod for gopls/v0.4.1

Change-Id: I53c2e4a93fffa705365c5c5acc702b5639f0be59
Reviewed-on: https://go-review.googlesource.com/c/tools/+/233837
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
diff --git a/gopls/go.mod b/gopls/go.mod
index 5f3bdbb..7356e20 100644
--- a/gopls/go.mod
+++ b/gopls/go.mod
@@ -4,7 +4,7 @@
 
 require (
 	github.com/sergi/go-diff v1.1.0
-	golang.org/x/tools v0.0.0-20200511201605-7a6cbdc4e8f0
+	golang.org/x/tools v0.0.0-20200513154647-78b527d18275
 	honnef.co/go/tools v0.0.1-2020.1.3
 	mvdan.cc/xurls/v2 v2.1.0
 )