Add new generation options

• mark old methods as deprecated

Add netstandard20 support

v2.0.1

ch: add coverage badge

Add threading support

Adds support for threading

Adds finer control methods

• Adds user character sets
• Adds seeds for the random generator system

Adds a new Generate method

Adds a new Generate method that allows for a shortid to be generated with just a length as a parameter

Initial release

Adds the two basic generation methods