add probot

example/pubspec.yaml

@@ -8,6 +8,7 @@ description: Demonstrates how to use the hello plugin.
 # build by specifying --build-name and --build-number, respectively.
 # Read more about versioning at semver.org.
 version: 1.0.0+1
+publish_to: none
 
 environment:
   sdk: ">=2.0.0-dev.68.0 <3.0.0"