Add a changelog entry for ADHelperVectorFunction

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+New: A new class Differentiation::AD::ADHelperVectorFunction has been
+added to help implement point-wise vector functions using automatic 
+differentiation. In particular, this class is designed to compute the 
+Jacobian of a vector function that is parameterized in
+terms of scalar, vector, and tensor arguments. One example of its use
+would be to compute the linearization of a multi-field constitutive
+law that is expressed in terms of some kinetic variables.
+<br>
+(Jean-Paul Pelteret, 2019/03/21)