Add reference to CNCF
Add reference to CNCF

https://www.cncf.io/blog/2018/03/29/cncf-to-host-open-policy-agent-opa

Signed-off-by: Chris Aniszczyk <2a3e0ec6821d10bf53e535c46e422f24d94584b5@gmail.com>

open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,open-policy-agent/opa