Update
* Refine templates handling
* `Backtesting`: extract trial parameters into `/home/ubuntu/.MartinBinance/trial_params.json`, [detail here.](https://github.com/DogsTailFarmer/martin-binance/wiki/Back-testing-and-parameters-optimization#some-details)
* `Backtesting`: add logging importance parameters rating for each optimisation cycle
* Up requirements for exchanges-wrapper==2.1.8