Fix typo in reference for MessageRegistry to be v1_0_0.
Fix typo in reference for MessageRegistry to be v1_0_0.

keedya/on-http,lanchongyizu/on-http,keedya/on-http,larry-dean/on-http,keedya/on-http,larry-dean/on-http,larry-dean/on-http,RackHD/on-http,lanchongyizu/on-http,larry-dean/on-http,keedya/on-http,RackHD/on-http,RackHD/on-http,lanchongyizu/on-http,RackHD/on-http,lanchongyizu/on-http