changelog.txt: update. #1122

Job	Run time
clippy_format	2m 33s
lockfile	1m 8s
build_wasm (nightly)	55s
build_lib_test (nightly)	59s
build_wasm (beta)	51s
build_lib_test (beta)	1m 20s
build_wasm (stable)	50s
build_wasm ($MSRV)	2m 51s
build_lib_test (stable)	1m 29s
no_features_build_test (nightly)	33s
no_features_build_test (beta)	33s
build_bin_spec (nightly)	1m 6s
no_features_build_test (stable)	31s
build_bin_spec (beta)	1m 12s
no_features_build_test ($MSRV)	2m 32s
build_bin_spec (stable)	1m 21s
build_lib_test ($MSRV)	3m 38s
build_bin_spec ($MSRV)	3m 8s
	27m 30s

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