gopls: update go.mod for gopls/v0.6.1-pre.1

Change-Id: I3337e90054b38206fd46053b8151e8886f625be4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/278786
Trust: Rebecca Stambler <rstambler@golang.org>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>

Author: stamblerre

gopls/go.mod

@@ -5,7 +5,7 @@ go 1.12
 require (
 	github.com/sanity-io/litter v1.3.0
 	github.com/sergi/go-diff v1.1.0
-	golang.org/x/tools v0.0.0-20201211192254-72fbef54948b
+	golang.org/x/tools v0.0.0-20201217163546-c88dec5c6b05
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 	honnef.co/go/tools v0.0.1-2020.1.6
 	mvdan.cc/gofumpt v0.0.0-20200927160801-5bfeb2e70dd6

gopls/go.sum

@@ -58,6 +58,8 @@ golang.org/x/tools v0.0.0-20200410194907-79a7a3126eef/go.mod h1:EkVYQZoAsY45+roY
 golang.org/x/tools v0.0.0-20200731060945-b5fad4ed8dd6/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20201211192254-72fbef54948b h1:8fYBhX5ZQZtb7nVKo58TjndJwMM+cOB1xOnfjgH3uiY=
 golang.org/x/tools v0.0.0-20201211192254-72fbef54948b/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.0.0-20201217163546-c88dec5c6b05 h1:4hzTNH658xirWc4MvAx9HK2/2hY6z42i1+lRK8OzeJE=
+golang.org/x/tools v0.0.0-20201217163546-c88dec5c6b05/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=