Add changelog entry

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+Changed: The type of exact_solution in VectorTools::integrate_difference() was
+double and fe_function could have any numerical type (double, float,
+std::complex<double> or std::complex<float>). This would lead in certain cases
+to unnecessary casts, for example from double to float. In addition it was not
+possible to compare a std::complex exact_solution to a std::complex fe_function.
+Now the types of exact_solution and fe_function must be the same, as a result
+integrate_difference() can be used to compare a std::complex exact_solution to
+a std::complex fe_function. The old version of the function has been deprecated.
+<br>
+(Daniel Garcia-Sanchez, 2019/10/09)