v2.4.0 Update

This update has added support for common anode displays, so you can now use common anode and common cathode displays. Common anode displays have one positive pin, and a negative pin for each segment. Common cathode displays have one ground pin and a positive pin for each segment (most popular).
The seven segment display is now declared with a boolean at the end of the statement, stating whether it is common anode or cathode (Default is true, which is common cathode).