Add changelog entry

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+Fixed: Fix a bug where only one CUDAWrappers::MatrixFree object was valid at a
+given time. There is now a variable CUDAWrappers::mf_n_concurrent_objects in
+base/cuda_size.h that controls the maximum number of concurrent objects. The
+default value is five.
+<br>
+(Bruno Turcksin, 2020/05/29)