Backtrade

Fix
* Fix typo ([23](https://github.com/34j/backtrade/issues/23)) ([`3293d5b`](https://github.com/34j/backtrade/commit/3293d5be0ef2b91888d9e707ff6378a9c37a294c))

Fix
* Fix OrderBase typing ([22](https://github.com/34j/backtrade/issues/22)) ([`7db5e20`](https://github.com/34j/backtrade/commit/7db5e204a43073e86427e1a5d7589d2676ff5087))

Feature
* Add __add__ and __mul__ for results ([21](https://github.com/34j/backtrade/issues/21)) ([`04a2c71`](https://github.com/34j/backtrade/commit/04a2c7164a93db815e0add43cf91428e5a959261))

Feature
* Show tqdm bar ([20](https://github.com/34j/backtrade/issues/20)) ([`db30e8f`](https://github.com/34j/backtrade/commit/db30e8f143519bff778416437f9b7c36699855b9))

Feature
* Add more metrics ([19](https://github.com/34j/backtrade/issues/19)) ([`a696a39`](https://github.com/34j/backtrade/commit/a696a3962b8463406d7a81630b1f903d3fa2c82f))

Fix
* Fix wrong fee calculation ([18](https://github.com/34j/backtrade/issues/18)) ([`abfaa6a`](https://github.com/34j/backtrade/commit/abfaa6a4443f3373cd69aed18ebf3eac9ef701af))