Prop 167: Token Registry Proposal: adding Neutron (NTRN).

This is a token registry proposal to add Neutron (NTRN). Please vote 'Yes' if you support to this proposal, and 'No' if you oppose it. Commonwealth post for NTRN: https://commonwealth.im/ux/discussion/17696-new-asset-listing-ntrn-proposed-parameters. Please update your price feeder config to support NTRN