Merge pull request #272 from CESNET/README-update #297

Job	Run time
check / clang-checks	1m 40s
check / editor-config	8s
build-os-matrix	2s
make-tests (oraclelinux:9) / tests	1m 59s
rpm-build (oraclelinux:9) / rpm-build	5m 53s
build (oraclelinux:9) / build	2m 13s
ipfix-elements-check / ipfix-elements-checks	45s
rpm-install (oraclelinux:9) / rpm-install	1m 24s
	14m 4s

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