Fix 0.16.0-rc.3 release date.
Fix 0.16.0-rc.3 release date.

derekmarcotte/node_exporter,derekmarcotte/node_exporter,prometheus/node_exporter,prometheus/node_exporter,derekmarcotte/node_exporter,derekmarcotte/node_exporter,siavashs/node_exporter,siavashs/node_exporter,siavashs/node_exporter,prometheus/node_exporter,siavashs/node_exporter