gopls: upgrade golang.org/x/tools for gopls/v0.4.2-pre3

Change-Id: I3ec6a854f86c49798143918a05d78175bba1a9f1
Reviewed-on: https://go-review.googlesource.com/c/tools/+/240544
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

gopls/go.mod

@@ -4,7 +4,7 @@ go 1.13
 
 require (
 	github.com/sergi/go-diff v1.1.0
-	golang.org/x/tools v0.0.0-20200625172446-0e13de11fa27
+	golang.org/x/tools v0.0.0-20200630154708-24ca011bb20f
 	honnef.co/go/tools v0.0.1-2020.1.4
 	mvdan.cc/xurls/v2 v2.2.0
 )