[gopls-release-branch.0.4] gopls: update go.mod for v0.4.2-pre2

Change-Id: If8e741cc3cd6eaed4568e836995c1bbda62f6d77
Reviewed-on: https://go-review.googlesource.com/c/tools/+/239982
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
diff --git a/gopls/go.mod b/gopls/go.mod
index a755e12..8257ac0 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 v0.0.0-20200623225707-463a27d6af32
+	golang.org/x/tools v0.0.0-20200625172446-0e13de11fa27
 	honnef.co/go/tools v0.0.1-2020.1.4
 	mvdan.cc/xurls/v2 v2.2.0
 )