Modify cancel clickListener name.

Author: zengsong

pickerview/src/main/java/com/bigkoo/pickerview/builder/OptionsPickerBuilder.java

@@ -51,7 +51,7 @@ public OptionsPickerBuilder isDialog(boolean isDialog) {
         return this;
     }
 
-    public OptionsPickerBuilder setOnCancelClickListener(View.OnClickListener cancelListener) {
+    public OptionsPickerBuilder addOnCancelClickListener(View.OnClickListener cancelListener) {
         mPickerOptions.cancelListener = cancelListener;
         return this;
     }