Add different formatting options

[EVODelavega]

• Added support for line-breaks to be included in the ToC
• Added the option to generate the ToC in a formatted table-like structure.
• These options can be toggled on/off by setting a variable in your .vimrc file. Documentation in README.md updated
• added examples of generated ToC to the README file.
• Installation instructions updated, specifically adding the {'do': 'chmod +x ./bin/mdctags'} to the vim-plug instructions
• slight changes to the mdctags script (e.g. changing strlen to mb_strlen, variable names, etc...)

[taoso]

It seems the github does not support the format you added.

https://github.com/lvht/tagbar-markdown/blob/77088fe54348b4a53196beb3bd9455e41d27cb5f/README.md