Adds section about sponsorship of continued development

Dead Man's Snitch has been gracious enough to give me time to improve
the build pack and give back to the community. Without that support my
changes and continued maintenance wouldn't be possible.

Author: gaffneyc

README.md

@@ -82,6 +82,17 @@ heroku config:set JEMALLOC_VERSION=3.6.0
 The complete and most up to date list of supported versions and stacks is
 available on the [releases page.](https://github.com/gaffneyc/heroku-buildpack-jemalloc/releases)
 
+## Thanks
+
+Continued development of the jemalloc buildpack is sponsored by [Dead Man's Snitch](https://deadmanssnitch.com).
+Ever been surprised that a critical scheduled task was silently failing to
+run? Whether it's backups, cache clearing, or sending invoices, Dead Man's Snitch makes it easy to
+[monitor heroku scheduler](https://deadmanssnitch.com/docs/heroku) tasks or to add
+[cron job monitoring](https://deadmanssnitch.com/docs/cron-job-monitoring)
+to your other services.
+
+Get started for free today with [Dead Man's Snitch on Heroku](http://github.com/deadmanssnitch/heroku-buildpack-dms)
+
 ## Building
 
 This uses Docker to build against Heroku