Support for list styles

[chaitanya1248]

Steps for Reproduction

1. Visit quill.com

2. provide list style type anything other than 'bullet', 'ordered'

Example: [{ list: 'ordered' }, { list: 'bullet' }, {list: 'circle'}]

Expected behavior:
Quill should interpret other forms of list styles and render them accordingly
Actual behavior:
Quill does not render lists other than 'ordered' (numbers) and 'bullet'
Platforms:
All

Version:

2.0.2