all: remove unused golang.org/x/exp from mod file

Fixes #1324

Change-Id: I6720e3730269586e901add5ee5a714f9b4e97aae
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/52910
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Noah Dietz <ndietz@google.com>

Author: codyoss

go.mod

@@ -15,7 +15,6 @@ require (
 	github.com/googleapis/gax-go/v2 v2.0.5
 	github.com/jstemmer/go-junit-report v0.9.1
 	go.opencensus.io v0.22.3
-	golang.org/x/exp v0.0.0-20200228211341-fcea875c7e85
 	golang.org/x/lint v0.0.0-20200302205851-738671d3881b
 	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d

go.sum

@@ -142,8 +142,6 @@ golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6 h1:QE6XYQK6naiK1EPAe1g/ILLxN5RBoH5xkJk3CqlMI/Y=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
-golang.org/x/exp v0.0.0-20200228211341-fcea875c7e85 h1:jqhIzSw5SQNkbu5hOGpgMHhkfXxrbsLJdkIRcX19gCY=
-golang.org/x/exp v0.0.0-20200228211341-fcea875c7e85/go.mod h1:4M0jN8W1tt0AVLNr8HDosyJCDCDuyL9N9+3m7wDWgKw=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=

tools.go

@@ -26,7 +26,6 @@ package cloud
 import (
 	_ "github.com/golang/protobuf/protoc-gen-go"
 	_ "github.com/jstemmer/go-junit-report"
-	_ "golang.org/x/exp/cmd/apidiff"
 	_ "golang.org/x/lint/golint"
 	_ "golang.org/x/tools/cmd/goimports"
 	_ "honnef.co/go/tools/cmd/staticcheck"