Merge pull request #3 from github/unmaintained

Update README to reflect unmaintained status

README.md

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+**NOTE: This repository is no longer supported or updated by GitHub. If you wish to continue to develop this code yourself, we recommend you fork it.**
+
 # PagerDuty Incident Webhooks
 
 This fires a webhook of incident data for each triggered incident PagerDuty in your account. Ideally, you'd point this at another tiny app that processes the events and does your bidding with them - ships them to campfire, APN, a tiny sinatra app that pipes incidents to `say`...go nuts.
@@ -40,4 +42,4 @@ Large parts of this are based on the PagerDuty library [@leejones](https://githu
 Copying
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-Copyright 2012, GitHub, Inc. See the `LICENSE` file for license rights and limitations (MIT).
+Copyright 2012, GitHub, Inc. See the `LICENSE` file for license rights and limitations (MIT).