Update tile.py

Author: ashishsingal1

pandas/tools/tile.py

@@ -153,6 +153,7 @@ def qcut(x, q, labels=None, retbins=False, precision=3, duplicates='raise'):
         The precision at which to store and display the bins labels
     duplicates : {'raise', 'drop'}, optional
         If binned edges are not unique, raise ValueError or drop non-uniques.
+        .. versionadded:: 0.20.0
 
     Returns
     -------