Epymetheus

* Create CONTRIBUTING.md

* Create Sphinx documentation (49)

* ENH: Add an option `check_trade` to `Strategy.run()` (close 32) (37)

* ENH: Add `Trade.to_dict()`, `Trade.to_json()`, `Trade.load_dict()`, `Trade.load_json()` (36)

* GITHUB: Create GitHub Action to bump version (close 31)

* ENH: Enable Strategy to dump and load trades as JSON format (close 40) (41)

* Add `utils.train_test_roll` (24) (25)

* ENH: Enable `Strategy` to load history and universe by `load()` (8)

* REF: Remove depricated features (28)

* REF: Fix docstring (21)

* REF: Use `print_if_verbose` to simplify run (19)

* GITHUB: Create CODE_OF_CONDUCT.md (12)

* ENH: Make `NoTradeError` warning (close 10) (14)

* ENH: Expose `StrategyList` and `StrategyDict` (close 11) (15)