hodltree flashloan exchange integration

[hodltree-dev]

HodlTree StableSwap 2.0 provides an opportunity to exchange stablecoins at a fixed rate of 1 to 1. Zero-slippage exchange became possible thanks to another HodlTree module - Flash Loans 2.0, on the basis of which StableSwap 2.0 was created. The module is currently available on Polygon and its Borrowing fees are fixed at 0.05% of the exchange amount.