update

Changelog

@@ -2,7 +2,7 @@ version 1.3.0 (release tag v1.3.0rel)
 =====================================
  * zero pad years in strtime (issue #194)
  * have cftime.datetime constuctor create 'calendar-aware' instances (default is
-   'standard' calendar, if calendar='' the instance is not calendar aware and some
+   'standard' calendar, if calendar='' or None the instance is not calendar aware and some
    methods, like dayofwk, dayofyr, __add__ and __sub__, will not work). Fixes issue #198.
    The calendar specific sub-classes are now deprecated, but remain for now
    as stubs that just instantiate the base class and override __repr__.