feat(Label): fixing size prop and extending HTMLLabelElement

types/reactstrap/lib/Label.d.ts

@@ -1,6 +1,10 @@
 import { ColumnProps } from './Col';
 
-interface Props {
+interface Intermediate extends React.ChangeTargetHTMLProps<HTMLLabelElement> {
+  size?: any;
+}
+
+interface Props extends Intermediate {
   hidden?: boolean;
   check?: boolean;
   inline?: boolean;
@@ -17,4 +21,4 @@ interface Props {
 }
 
 declare var Label: React.StatelessComponent<Props>;
-export default Label;
+export default Label;