CHANGELOG: update for 1.9.1 #465

Job	Run time
coverage-test	6m 50s
generic-build-test (ubuntu-18.04, gcc)	7m 5s
fuzzing-test	4m 27s
generic-build-test (ubuntu-18.04, clang)	6m 30s
coverity-test	0s
generic-build-test (ubuntu-20.04, gcc)	6m 39s
generic-build-test (ubuntu-20.04, clang)	5m 47s
generic-build-test (fedora-30, gcc)	7m 50s
generic-build-test (fedora-30, clang)	6m 23s
generic-build-test (opensuse-leap, gcc)	6m 47s
generic-build-test (opensuse-leap, clang)	6m 11s
generic-build-test (ubuntu-22.04, gcc)	42m 20s
	1h 46m 49s

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