Add a changelog entry.

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+Changed: Calling GridGenerator::refine_and_coarsen_fixed_fraction()
+and GridGenerator::refine_and_coarsen_fixed_fraction() with values for
+the coarsen and refine fractions that added to 1.0 in exact
+arithmetic, but something slightly larger in floating point
+arithmetic, resulted in an error. These functions are now slightly
+more relaxed in that they allow arguments that add to 1.0 up to a
+small floating point round off error.
+<br>
+(Wolfgang Bangerth, 2018/06/18)