Dark Cloud Backtest

This is a bearish reversal pattern formed by two candlesticks within a uptrend.
Consists of an up candlestick followed by a down candlestick which opens lower
than the prior candlestick and closes below the midrange of the prior candlestick.
It is the reverse of the Piercing Line.

WARNING:
- For purpose educate only
- This script to change bars colors.