made placeholderLabel public so subclasses outside of the module can function

Author: barrettj

TextFieldEffects/TextFieldEffects/TextFieldsEffects.swift

@@ -17,7 +17,7 @@ extension String {
 
 public class TextFieldEffects : UITextField {
 
- let placeholderLabel = UILabel()
+ public let placeholderLabel = UILabel()
 
  public func animateViewsForTextEntry() {
  fatalError("\(__FUNCTION__) must be overridden")