gopls: update go.mod for gopls/v0.4.4-pre3

Change-Id: Iecce3cdebc8a75df2751a6dd485f7885a274f4ff
Reviewed-on: https://go-review.googlesource.com/c/tools/+/245542
Run-TryBot: Rebecca Stambler <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Ian Cottrell <[email protected]>

Author: stamblerre

gopls/go.mod

@@ -4,7 +4,7 @@ go 1.13
 
 require (
 	github.com/sergi/go-diff v1.1.0
-	golang.org/x/tools v0.0.0-20200729043935-8d204f81af1d
+	golang.org/x/tools v0.0.0-20200729181040-64cdafbe085c
 	honnef.co/go/tools v0.0.1-2020.1.4
 	mvdan.cc/gofumpt v0.0.0-20200709182408-4fd085cb6d5f
 	mvdan.cc/xurls/v2 v2.2.0