Add entry log

diff --git a/doc/news/changes/minor/20190808BrunoTurcksin b/doc/news/changes/minor/20190808BrunoTurcksin
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+New: Add a new parameter to CUDAWrappers::MatrixFree::AdditionalData to choose
+between graph coloring and atomics in CUDAWrappers::MatrixFree::cell_loop().
+The atomic implementation is faster on Pascal and newer architectures.
+<br>
+(Bruno Turcksin, 2019/08/08)