0.03 2019-06-17
-new feature: on_shutdown() returns a promise which is resolved when the channel is shut down (ehuels)

0.02 2019-06-06
-bugfix: 'get()' followed by 'put()' lacks 'drain()' ==> blocks the channel (thanks to ehuels for identifying and fixing)

0.01 2018-12-19
-Initial release