nanoid 0.4.0

A tiny, secure, URL-friendly, unique string ID generator for Rust.
Documentation
# Change Log
This project adheres to [Semantic Versioning](http://semver.org/).

## 0.4.0
* merge #25, from @fundon: bump the rand#0.8
* merge #18, from @svenstaro
* merge #21, from @svenstaro
* merge #19, from @svenstaro
* merge #20, from @svenstaro
* merge #16, from @Exr0n
* merge #15, from @Exr0n
* merge #10, from @nbraud


## 0.3.0
* merge #3, from @TheIronBorn: various small improvements
* merge #4, from @delimitry: fix typo in function name
* Replace the `~` to `-` in alphabet
* Add the common macros
* Refactor structure. Remove pseudo-fast generator. Move format in `lib.rs`

## 0.2.0
* Added support for Windows
* Moved to system randomness generator

## 0.1.3
* Renamed the safe alphabet
* Added readme from rustdoc

## 0.1.2
* Updated the random number engine.
* Fixed bugs in documentation.

## 0.1.1
* Integrated performance tests
* Added example of custom random number generator.

## 0.1.0
* Initial release

## 0.0.1
* The start of the project.