2.1.1

Added the ability to backup trade/positions to trades/positions to allow trading bot restart.
Added a dry mode simulating buy/sell orders and the corresponding increase/decrease of your simulated accounts.
Added a method to position to retrieve the last gain calculated from ticker.
Added an canBuy and canSell method to know if you have enough funds to buy/sell.
Added a collection of last received tickers to strategy.
Updates of XChange, Spring Boot & Reactor librairies.