examples: remove unecessary require on protobuf example [skip ci]
examples: remove unecessary require on protobuf example [skip ci]

JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl