2020-12-09, Version 15.4.0 (Current)

PR-URL: https://github.com/nodejs/node/pull/36435

Notable changes:

* child_processes:
  * add AbortSignal support (Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/36308)
* deps:
  * update ICU to 68.1 (Michaël Zasso) (https://github.com/nodejs/node/pull/36187)
* events:
  * support signal in EventTarget (Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/36258)
  * graduate Event, EventTarget, AbortController (James M Snell) (https://github.com/nodejs/node/pull/35949)
* http:
  * enable call chaining with setHeader() (pooja d.p) (https://github.com/nodejs/node/pull/35924)
* module:
  * add isPreloading indicator (James M Snell) (https://github.com/nodejs/node/pull/36263)
* stream:
  * support abort signal (Benjamin Gruenbaum) (https://github.com/nodejs/node/pull/36061)
  * add FileHandle support to Read/WriteStream (Momtchil Momtchev) (https://github.com/nodejs/node/pull/35922)
* worker:
  * add experimental BroadcastChannel (James M Snell) (https://github.com/nodejs/node/pull/36271)