Use enum for MessageEvent Type, Link Type and SpanKind#334

mayurkale22 merged 2 commits intocensus-instrumentation:mastercensus-instrumentation/opencensus-node:masterfrom

mayurkale22:enum_for_link_message_event_spankindmayurkale22/opencensus-node:enum_for_link_message_event_spankindCopy head branch name to clipboard