2019-10-11, Version 12.12.0 (Current)

Notable changes:

* build:
  * Add `--force-context-aware` flag to prevent usage of native node
    addons that aren't context aware
    https://github.com/nodejs/node/pull/29631
* deprecations:
  * Add documentation-only deprecation for `process._tickCallback()`
    https://github.com/nodejs/node/pull/29781
* esm:
  * Using JSON modules is experimental again
    https://github.com/nodejs/node/pull/29754
* fs:
  * Introduce `opendir()` and `fs.Dir` to iterate through directories
    https://github.com/nodejs/node/pull/29349
* process:
  * Add source-map support to stack traces by using
    `--source-map-support` https://github.com/nodejs/node/pull/29564
* tls:
  * Honor `pauseOnConnect` option
    https://github.com/nodejs/node/pull/29635
  * Add option for private keys for OpenSSL engines
    https://github.com/nodejs/node/pull/28973

PR-URL: https://github.com/nodejs/node/pull/29919