Nanoid

* Fix old Node.js support.

* Add `nanoid/async`.
* Fix `nanoid/non-secure` JSDoc.
* Add Chinese documentation (by Wenliang Dai).
* Speed up and reduce size of `nanoid/non-secure` (by Ori Livni).

Changed

- Resolved [1](https://github.com/hidehalo/nanoid-php/issues/1) via:

jenky (1):
Update: fix version conflicts of random_compat2 in PHP5.6&PHP7

Changed

- Sync with commits [Calculate mask based on alphabet length](https://github.com/ai/nanoid/commit/3e641fe06171f65cb22623e1c2ca98d9c74d97bd)
- Sync with commits [Reverse loop, reuse var](https://github.com/ai/nanoid/commit/c42849cb80a302166fd8c9f188701d1012eeb7d4)
- Sync with commits [Reduce default ID length. Issue](https://github.com/ai/nanoid/commit/3bdea68c75cbf639826fc1f21a66d13db643607b)
- Sync with commits [Clean up alphabet limit reason](https://github.com/ai/nanoid/commit/a0c97caa1d6851e2d858a37e1c37c65930b325f4)

* Add non-secure ID generator.
* Suggest to use non-secure ID generator for React Native developers.
* Reduce size.

Changed

- Add example scripts
- Add benchmark scripts
- Rename `Client::generate(...)` to `Client::generateId(...)`
- Add `Client::formatedId(...)` method
- Improve code coverage to 100%
- Add DOCs in source codes