added changelog for issue 563

Author: alixdamman

doc/source/changes/version_0_30.rst.inc

@@ -221,6 +221,8 @@ Miscellaneous improvements
 * renamed `a_min` and `a_max` arguments of :py:obj:`LArray.clip()` as `minval` and `maxval` respectively
   and made them optional (closes :issue:`747`).
 
+* improved speed of :py:obj:`read_hdf()` function when reading a stored LArray object (closes :issue:`563`).
+
 
 Fixes
 -----