gopls: update go.mod for gopls/v0.5.2-pre.1

Change-Id: I3d648b24c4e13be5efdb629dd64369b33922d8c5
Reviewed-on: https://go-review.googlesource.com/c/tools/+/264206
Trust: Rebecca Stambler <rstambler@golang.org>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>

Author: stamblerre

gopls/go.mod

@@ -4,7 +4,7 @@ go 1.12
 
 require (
 	github.com/sergi/go-diff v1.1.0
-	golang.org/x/tools v0.0.0-20200930165741-f1523d29dbb9
+	golang.org/x/tools v0.0.0-20201021220610-098fe8545dc5
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 	honnef.co/go/tools v0.0.1-2020.1.5
 	mvdan.cc/gofumpt v0.0.0-20200802201014-ab5a8192947d