[README.md] coverage: L:99% F:99% B:94% #78

Job	Run time
win10_cl_Debug \| CC=cl CXX=cl \| windows-2022	6m 26s
lnx_clang_Debug \| CC=clang CXX=clang++ \| ubuntu-latest	2m 59s
lnx_gcc_Release \| CC=gcc CXX=g++ \| ubuntu-latest	2m 35s
mac_clang_Debug \| CC=clang CXX=clang++ \| macos-latest	1m 21s
mac_Xcode_Debug \| CC=cc CXX=c++ \| macos-latest	1m 56s
win11_clang_Debug \| CC=clang CXX=clang++ \| windows-latest	11m 11s
win11_cl_Release \| CC=cl CXX=cl \| windows-latest	3m 30s
win11_cl_Debug \| CC=cl CXX=cl \| windows-latest	2m 40s
lnx_clang_Release \| CC=clang CXX=clang++ \| ubuntu-latest	2m 46s
mac_Xcode_Release \| CC=cc CXX=c++ \| macos-latest	1m 52s
win10_cl_Release \| CC=cl CXX=cl \| windows-2022	3m 50s
mac_gcc_Debug \| CC=gcc CXX=g++ \| macos-latest	1m 12s
lnx_gcc_Debug \| CC=gcc CXX=g++ \| ubuntu-latest	2m 56s
win11_clang_Release \| CC=clang CXX=clang++ \| windows-latest	2m 9s
mac_clang_Release \| CC=clang CXX=clang++ \| macos-latest	1m 18s
mac_gcc_Release \| CC=gcc CXX=g++ \| macos-latest	1m 2s
	49m 43s

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