add probot

.github/no-response.yml

@@ -0,0 +1,15 @@
+# Configuration for probot-no-response - https://github.com/probot/no-response
+
+# Number of days of inactivity before an issue is closed for lack of response.
+daysUntilClose: 7
+
+# Label requiring a response.
+responseRequiredLabel: "waiting for response"
+
+# Comment to post when closing an Issue for lack of response. Set to `false` to disable
+closeComment: >
+  Without additional information, I'm unfortunately not sure how to
+  resolve this issue. I'm therefore reluctantly going to close this
+  bug for now. Please don't hesitate to comment on the bug if you have
+  any more information for us; I will reopen it right away!
+  Thanks for your contribution.

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"