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Add note about extensions needing to be OSS (#113)

* Add note about extensions needing to be OSS

* Update README.md

* Update README.md
H
Hayden Young committed
80c19878e0c65e96c335d4270933e6d95c8a309e
Parent: 18f395b
Committed by Asher <ash@coder.com> on 3/22/2019, 7:58:13 PM