2019-08-20, Version 12.9.0 (Current)

Notable changes:

* crypto:
  * Added an oaepHash option to asymmetric encryption which allows
    users to specify a hash function when using OAEP padding.
    https://github.com/nodejs/node/pull/28335
* deps:
  * Updated V8 to 7.6.303.29. https://github.com/nodejs/node/pull/28955
    * Improves the performance of various APIs such as `JSON.parse` and
      methods called on frozen arrays.
    * Adds the Promise.allSettled method.
    * Improves support of `BigInt` in `Intl` methods.
    * For more information: https://v8.dev/blog/v8-release-76
  * Updated libuv to 1.31.0. https://github.com/nodejs/node/pull/29070
    * `UV_FS_O_FILEMAP` has been added for faster access to memory
      mapped files on Windows.
    * `uv_fs_mkdir()` now returns `UV_EINVAL` for invalid filenames on
      Windows. It previously returned `UV_ENOENT`.
    * The `uv_fs_statfs()` API has been added.
    * The `uv_os_environ()` and `uv_os_free_environ()` APIs have been
      added.
* fs:
  * Added `fs.writev`, `fs.writevSync` and `filehandle.writev` (promise
    version) methods. They allow to write an array of `ArrayBufferView`s
    to a file descriptor. https://github.com/nodejs/node/pull/25925
    https://github.com/nodejs/node/pull/29186
* http:
  * Added three properties to `OutgoingMessage.prototype`:
    `writableObjectMode`, `writableLength` and `writableHighWaterMark`
    https://github.com/nodejs/node/pull/29018
* stream:
  * Added an new property `readableEnded` to readable streams. Its value
    is set to `true` when the `'end'` event is emitted.
    https://github.com/nodejs/node/pull/28814
  * Added an new property `writableEnded` to writable streams. Its value
    is set to `true` after `writable.end()` has been called.
    https://github.com/nodejs/node/pull/28934

PR-URL: https://github.com/nodejs/node/pull/29210