Update appengine for the Go 1.11 runtime.

https://cloud.google.com/appengine/docs/standard/go111/go-differences
This is untested, because I wasn't actually able to deploy without
enabling Cloud Build and setting up a billing account.

appengine/.gcloudignore

@@ -0,0 +1,25 @@
+# This file specifies files that are *not* uploaded to Google Cloud Platform
+# using gcloud. It follows the same syntax as .gitignore, with the addition of
+# "#!include" directives (which insert the entries of the given .gitignore-style
+# file at that point).
+#
+# For more information, run:
+#   $ gcloud topic gcloudignore
+#
+.gcloudignore
+# If you would like to upload your .git directory, .gitignore file or files
+# from your .gitignore file, remove the corresponding line
+# below:
+.git
+.gitignore
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+# Test binary, build with `go test -c`
+*.test
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out

appengine/app.yaml

@@ -1,7 +1,6 @@
-runtime: go
-api_version: go1
+runtime: go111
 
 handlers:
 - url: /.*
-  script: _go_app
   secure: always
+  script: auto

appengine/reflect.go

@@ -1,6 +1,6 @@
 // A web app for Google App Engine that proxies HTTP requests and responses to
 // the Snowflake broker.
-package reflect
+package main
 
 import (
 	"context"