WD Gann - Square of 9 - BTCUSD

Applying one method from WD Gann's "Square of 9" toolkit.

Find a range low and run this calculation to get the range high:
```
( sqrt(range low) * 2 ) ^ 2 = range high price
```
Find a range high and run this calculation to get the range low:
```
( sqrt(range high) / 2 ) ^ 2 = range low price
```

This chart has 4 example of this in action. Black, green, red, purple.
Calling it right now that 15800 (red) and 18600 (purple) are our "range low" relative to BTC's all time high.