Issue title: Favourite palette
 Issue body: Hi,
i really like this project and have an idea: it would be great to have a palette of some favourite colors on the right side, which the developer can set.
what is your opinion about this?

 Comments: 
 Comment 0: Hi @vtni it is planned for the future release 3.0 
https://github.com/mjolnic/bootstrap-colorpicker/pull/88 ;)

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