Proposed: Update Hyperledger CoC to match revised W3C CEPC

Hyperledger's existing Code of Conduct came from the W3C. They have updated their CEPC (their term for COC). The DCI-WG agrees with the W3C amendments and recommends that Hyperledger adopt the revised document available at https://www.w3.org/2020/05/CEPC.

Discussion of the differences submitted to our mail list here: https://lists.hyperledger.org/g/dci-wg/message/177

Existing Hyperledger CoC: https://github.com/hyperledger/tsc/blob/master/docs/code-of-conduct.md

Prior version of W3C CEPC: https://www.w3.org/Consortium/cepc/cepc-20151007/