CHANGES.md: note BLAKE2s supports BLAKE2b-like "size" setting #89

Job	Run time
compiler (gcc-7, ubuntu-20.04)	3m 50s
compiler (gcc-8, ubuntu-20.04)	3m 49s
compiler (gcc-9, ubuntu-20.04)	3m 51s
compiler (gcc-10, ubuntu-20.04)	7m 36s
compiler (gcc-11, ubuntu-22.04)	7m 22s
compiler (gcc-12, ubuntu-22.04)	9m 11s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	4m 25s
compiler (clang-6.0, ubuntu-20.04)	6m 28s
compiler (clang-7, ubuntu-20.04)	4m 4s
compiler (clang-8, ubuntu-20.04)	4m 4s
compiler (clang-9, ubuntu-20.04)	9m 17s
compiler (clang-10, ubuntu-20.04)	6m 19s
compiler (clang-11, ubuntu-20.04)	6m 8s
compiler (clang-12, ubuntu-20.04)	4m 2s
compiler (clang-13, ubuntu-22.04)	7m 32s
compiler (clang-14, ubuntu-22.04)	4m 44s
compiler (clang-15, ubuntu-22.04, jammy)	8m 18s
compiler (clang-16, ubuntu-22.04, jammy)	4m 41s
compiler (clang-17, ubuntu-22.04, jammy)	8m 15s
	1h 53m 56s

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