## v0.2.2
- add MovingAvg::Calculator for strategy facade class
- add Simple Moving Mean

## v0.2.1
- ignore NaN for Evaluator.error_sum

## v0.2.0
- add basic moving average strategies
  - Simple Moving Average
  - Weighted Moving Average
  - Exponentially Weighted Moving Average
  - Modified Moving Average

## v0.1.0

- Hello, world!