2019-05-28, Version 10.16.0 'Dubnium' (LTS)

Notable changes:

- **deps**:
  - update ICU to 64.2 (Ujjwal Sharma)
    [#27361](https://github.com/nodejs/node/pull/27361)
  - upgrade npm to 6.9.0 (Kat Marchán)
    [#26244](https://github.com/nodejs/node/pull/26244)
  - upgrade openssl sources to 1.1.1b (Sam Roberts)
    [#26327](https://github.com/nodejs/node/pull/26327)
  - upgrade to libuv 1.28.0 (cjihrig)
    [#27241](https://github.com/nodejs/node/pull/27241)
- **events**:
  - add once method to use promises with EventEmitter (Matteo Collina)
   [#26078](https://github.com/nodejs/node/pull/26078)
- **n-api**:
  - mark thread-safe function as stable (Gabriel Schulhof)
    [#25556](https://github.com/nodejs/node/pull/25556)
- **repl**:
  - support top-level for-await-of (Shelley Vohr)
    [#23841](https://github.com/nodejs/node/pull/23841)
- **zlib**:
  - add brotli support (Anna Henningsen)
    [#24938](https://github.com/nodejs/node/pull/24938)

PR-URL: https://github.com/nodejs/node/pull/27514