Add CHANGES.md entry for ess_cert_id_alg default change #70

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	35m 50s
minimal (windows-2019)	12m 15s
minimal (windows-2022)	13m 31s
plain (windows-2019)	22m 4s
plain (windows-2022)	24m 7s
shared (windows-2019, win64, enable-fips)	37m 17s
shared (windows-2019, win32, --strict-warnings no-fips)	45m 34s
shared (windows-2022, win64, enable-fips)	37m 33s
shared (windows-2022, win32, --strict-warnings no-fips)	45m 46s
	4h 33m 57s

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