Cassandre trading bot 4.2.0 released

The main feature is the ability to run several strategies in the same bot. For example, I run a bot trading BTC/USDT & UNI/USDT.

Others changes:

• Update to XChange 5.0.7.

• Improved integration tests and added some tests on Binance.

• Fulfill strategy accounts on start.

• Add a getter for exchange service in strategies