Update README.md

Author: pgleeson

README.md

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 to find out more about OpenWorm, please see the documentation at [http://docs.openworm.org](http://docs.openworm.org) or [join us on Slack](http://bit.ly/OpenWormVolunteer).
 
 This repository also contains project-wide tracking via high-level [issues](https://github.com/openworm/OpenWorm/issues) and [milestones](https://github.com/openworm/OpenWorm/milestones).
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