@geia/contractor (npm): Limit concurrency of an array of class instance whose async method is to be called
Keywords: race|limit|limited|concurrency|promise|async|es6|es7|promises|promises-a|promises-aplus|future|futures|deferred|deferreds|generator|generators|await|flow control|pool|queue|throttle|browser|node|throat|rate|batch|ratelimit|task