A dead simple crypto-balance calculator

I recently started experimenting with cryptocurrencies and I wanted to have a simple snippet that tells me my current, would-be balance — the current value of all my assets in their original buy-in fiat.

1. Log your assets in the assets.json (see the example.json for help)
   • crpytos should contain all your transactions
   • fiats should show the remaining balance you have at the exchange(s)
2. Run node index

                  50.00EUR
   51.00EUR ->    62.60EUR   +22.75%
-------------------------------------
                 112.60EUR

                 100.00USD
  500.00USD ->   816.30USD   +63.26%
-------------------------------------
                 916.30USD

This is only a snippet, nothing more. I was too lazy doing something else...