README.md: Fix Trello link (#501)

Update 'how to copy board' Trello instructions from 2012 blog post, to actual instructions.
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Vapeur redman 2018-09-27 16:26:33 -06:00 committed by hanjiexi
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@ -499,7 +499,7 @@ These aren't the only specializations you can choose. Check the following websit
1. Create an account in [Trello](https://trello.com/).
1. Copy [this](https://trello.com/b/9DPXYv5f) board to your personal account.
See how to copy a board [here](http://blog.trello.com/you-can-copy-boards-now-finally/).
See how to copy a board [here](https://help.trello.com/article/802-copying-cards-lists-or-boards).
Now that you have a copy of our official board, you just need to pass the cards to the `Doing` column or `Done` column as you progress in your study.