chore: update golang version

vendor/google.golang.org/appengine/travis_test.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+
+go version
+go test -v google.golang.org/appengine/...
+go test -v -race google.golang.org/appengine/...
+if [[ $GOAPP == "true" ]]; then
+  export PATH="$PATH:/tmp/sdk/go_appengine"
+  export APPENGINE_DEV_APPSERVER=/tmp/sdk/go_appengine/dev_appserver.py
+  goapp version
+  goapp test -v google.golang.org/appengine/...
+fi