Added Arduino 8 bit issue.

Author: CelliesProjects

README.md

@@ -7,6 +7,10 @@ An Arduino library to get the moon phase angle and percentage of the moon that i
 1. Download the latest release and unpack in the Arduino `libraries` folder.
 2. Restart the Arduino IDE.
 
-A simple example that should run on most Arduino supported boards is included.
+A simple example that should run on most 16 and 32 bits Arduino supported boards is included.
 
-A more elaborate example only suitable for an ESP32 with an ILI9341 tft display can be found in the `esp32/ILI9341` folder
+A more elaborate example only suitable for an ESP32 with an ILI9341 tft display can be found in the `esp32/ILI9341` folder.
+
+## Issues:
+
+This library will not work on most 8 bit Arduino boards, as these have no real `double` data type available.