Change isSigned to be observable

Add "dynamic" keyword to isSigned so it can be observed from the outside with KVO so the ViewControllers can react to the user writing something (for example by enabling the done button)

Author: FWFabio

Pod/Classes/EPSignatureView.swift

@@ -22,7 +22,7 @@ open class EPSignatureView: UIView {
 
     open var strokeColor = UIColor.black
     open var strokeWidth: CGFloat = 2.0
-    open var isSigned: Bool = false
+    dynamic open var isSigned: Bool = false
 
     // MARK: - Initializers