Update README.md

update readme

Author: hackware1993

README.md

@@ -30,7 +30,7 @@ him.
     10. baselineToBottom
     11. baselineToBaseline
 2. margin and goneMargin
-3. clickPadding (quickly expand the click area of child elements without changing their actual size)
+3. clickPadding (quickly expand the click area of child elements without changing their actual size, This means that the click area can be shared between child elements without increasing nesting.)
 4. visibility control
 5. constraint integrity hint
 6. bias