Add a changelog entry.

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+Changed: A number of classes implementing tensor-valued polynomials
+had a member function called `compute_n_pols()`. This name has now
+been changed to `n_polynomials()`, better reflecting our usual naming
+scheme as well as what the function does -- which in many cases is not
+actually computing but just returning something.
+<br>
+(Wolfgang Bangerth, 2019/08/2)