README: Updating the build process #166

Job	Run time
check / clang-checks	1m 36s
check / editor-config	9s
build-os-matrix	4s
build (oraclelinux:9) / build	2m 6s
make-tests (oraclelinux:9) / tests	1m 53s
rpm-build (oraclelinux:9) / rpm-build	5m 59s
rpm-install (oraclelinux:9) / rpm-install	1m 12s
	12m 59s

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