Add changelog.

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+Improved: The FEEvaluation::evaluate() and FEEvaluation::integrate() routines
+would previously unconditionally use an evaluation routine with a
+transformation to a collocation basis and subsequent collocation derivative
+for `n_q_points_1d > fe_degree` because it is faster for the usual case of
+`n_q_points_1d` close to the polynomial degree. Now, we switch back to the
+standard evaluation if `n_q_points_1d > 3 * (fe_degree+1) / 2` where that
+variant is faster.
+<br>
+(Martin Kronbichler, 2019/02/06)