Add a changelog entry.

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+Fixed: step-34 had a minor memory leak whereby the function
+`BEMProblem<2>::get_singular_quadrature()` allocated some memory the
+first time it was called, and then never released it. This is now
+fixed. Separately, this function was not thread-safe, and now it is.
+<br>
+(Wolfgang Bangerth, 2021/07/03)
+