this can stand, the convention is: 

    .. versonchanged:: 2.4 
       {New in version $foo:} <insert-text-here>

Otherwise, the paragraph that follows shouldn't be in the body of the directive. Also we've only ever (subject to caveat that this is only enforced by force of will) put a single paragraph in one of these directives, which I think its stylistically useful/worthwhile.  

I think there are wierdnesses about