Refact addon via es6 ( new syntax )

[vvscode]

What about addon refactoring via new es features ?

Chrome support most of features from the box. And code become more concise and readable

[luzhanov]

Well, it's a good idea, but let's wait till I'll rewrite plugin a little bit to the local-saving mode.
I need to change a lot after official API blocking.

But I will appreciate any help, cause JS is not my primary language for the development :)

[vvscode]

@luzhanov if you can split rewriting process into subtask - I'm ready to help.

[luzhanov]

@vvscode thanks a lot!
I've created a task for saving cards to local file - #10 , please take a look and ask me if you need any additional help.