update requirements

Author: fcollman

CONTRIBUTING.md

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+# Allen Institute Contribution Agreement
+
+This document describes the terms under which you may make “Contributions” — 
+which may include without limitation, software additions, revisions, bug fixes, configuration changes,
+documentation, or any other materials — to any of the projects owned or managed by the Allen Institute.
+If you have questions about these terms, please contact us at [email protected].  
+
+You certify that:
+
+•	Your Contributions are either:
+
+1.	Created in whole or in part by you and you have the right to submit them under the designated license 
+(described below); or
+2.	Based upon previous work that, to the best of your knowledge, is covered under an appropriate 
+open source license and you have the right under that license to submit that work with modifications,
+whether created in whole or in part by you, under the designated license; or
+
+3.	Provided directly to you by some other person who certified (1) or (2) and you have not modified them.
+
+•	You are granting your Contributions to the Allen Institute under the terms of the [2-Clause BSD license](https://opensource.org/licenses/BSD-2-Clause)
+(the “designated license”).
+
+•	You understand and agree that the Allen Institute projects and your Contributions are public and that 
+a record of the Contributions (including all metadata and personal information you submit with them) is 
+maintained indefinitely and may be redistributed consistent with the Allen Institute’s mission and the 
+2-Clause BSD license.