Heikin-Ashi Trend Alert

This script:

• Adds a Heikin-Ashi line to the chart (EMA-based).
  
• Provides alerts triggered when the color goes from green to red and vice versa.
  

Just add the indicator to the chart, create an alert and select "Heikin-Ashi Trend Alert" from the dropdown. Profit.

リリースノート:

• Fix a typo. Yep.
  

リリースノート:

• Just a dummy change to update the chart image.
  

リリースノート:

• Add "timeframe.period" in the alert message prefix.
  
• Examples: "", "", "", etc.