cloudfns: update to go1.13 runtime

We're running on an outdated version of Go, and should not be.

Change-Id: I650c9d74cf230c2c24939c79a270040026a489ca
Reviewed-on: https://go-review.googlesource.com/c/build/+/230637
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/cloudfns/issueswebhook/README.md b/cloudfns/issueswebhook/README.md
index b76ab06..ac2b7a4 100644
--- a/cloudfns/issueswebhook/README.md
+++ b/cloudfns/issueswebhook/README.md
@@ -3,7 +3,7 @@
 ```sh
 gcloud functions deploy GitHubIssueChangeWebHook \
   --project=symbolic-datum-552 \
-  --runtime go112 \
+  --runtime go113 \
   --trigger-http \
   --set-env-vars=GCS_BUCKET=<bucket name>,GITHUB_WEBHOOK_SECRET=<github webhook secret>
 ```
diff --git a/cloudfns/issueswebhook/go.mod b/cloudfns/issueswebhook/go.mod
index e4a9b3d..da92e8e 100644
--- a/cloudfns/issueswebhook/go.mod
+++ b/cloudfns/issueswebhook/go.mod
@@ -1,6 +1,6 @@
 module golang.org/x/build/cloudfns/issueswebhook
 
-go 1.12
+go 1.13
 
 require (
 	cloud.google.com/go/storage v1.1.0
diff --git a/cloudfns/sendwikidiff/README.md b/cloudfns/sendwikidiff/README.md
index 21b15e2..b8a42c6 100644
--- a/cloudfns/sendwikidiff/README.md
+++ b/cloudfns/sendwikidiff/README.md
@@ -3,7 +3,7 @@
 ```sh
 gcloud functions deploy HandleWikiChangePubSub \
   --project=symbolic-datum-552 \
-  --runtime go111 \
+  --runtime go113 \
   --trigger-topic github.webhooks.golang.go.wiki \
   --memory 1024 \
   --set-env-vars=SENDGRID_API_KEY=<SENDGRID_API_KEY>
diff --git a/cloudfns/sendwikidiff/go.mod b/cloudfns/sendwikidiff/go.mod
index f78f05f..b57af9a 100644
--- a/cloudfns/sendwikidiff/go.mod
+++ b/cloudfns/sendwikidiff/go.mod
@@ -1,5 +1,7 @@
 module golang.org/x/build/cloudfns/sendwikidiff
 
+go 1.13
+
 require (
 	github.com/sendgrid/rest v2.4.1+incompatible // indirect
 	github.com/sendgrid/sendgrid-go v3.4.1+incompatible
diff --git a/cloudfns/wikiwebhook/README.md b/cloudfns/wikiwebhook/README.md
index c3e9dcb..b70f39b 100644
--- a/cloudfns/wikiwebhook/README.md
+++ b/cloudfns/wikiwebhook/README.md
@@ -3,7 +3,7 @@
 ```sh
 gcloud functions deploy GitHubWikiChangeWebHook \
   --project=symbolic-datum-552 \
-  --runtime go111 \
+  --runtime go113 \
   --trigger-http \
   --set-env-vars=PUBSUB_TOPIC=github.webhooks.golang.go.wiki,GITHUB_WEBHOOK_SECRET=<github webhook secret>
 ```
diff --git a/cloudfns/wikiwebhook/go.mod b/cloudfns/wikiwebhook/go.mod
index 72c81c2..a653bc0 100644
--- a/cloudfns/wikiwebhook/go.mod
+++ b/cloudfns/wikiwebhook/go.mod
@@ -1,5 +1,7 @@
 module golang.org/x/build/cloudfns/wikiwebhook
 
+go 1.13
+
 require (
 	cloud.google.com/go v0.34.0
 	github.com/googleapis/gax-go v2.0.2+incompatible // indirect
diff --git a/cloudfns/wikiwebhook/go.sum b/cloudfns/wikiwebhook/go.sum
index 9de6b63..deb8218 100644
--- a/cloudfns/wikiwebhook/go.sum
+++ b/cloudfns/wikiwebhook/go.sum
@@ -5,11 +5,13 @@
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/googleapis/gax-go v2.0.2+incompatible h1:silFMLAnr330+NRuag/VjIGF7TLp/LBrV2CJKFLWEww=
 github.com/googleapis/gax-go v2.0.2+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=