MVP: Trade alts for XBT

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The original project auto DCAs from USD balance to XBT. The primary reason for this fork is to adapt the code to auto DCA Alts (Shitcoin Cost Average?) into sats.

The user should create a list of Alt tickers which are subject to being automatically traded.

e.x. ['STORJ', 'XMR', 'ETH']

A user may want to keep a certain balance of alts at all times and prefer that the script only sells any excess shitcoins above that threshold.

e.x.

[
    {
        alt: "STORJ",
        min: 50
    }
]

This setting would consider selling STORJ tokens if and only if the balance of STORJ exceeds 50 USD. It would trade an amount of STORJ such that, the remaining balance after the trade still exceeds $50 at the time of trade.

Additionally, there should be a global min-fee-threshold at which the script will actually make the purchase. For example, selling 1 STORJ is cost prohibitive as the trading fee outweighs the purchase amount.