Readme update (#4795) #2475

Job	Run time
macOS [UBSAN] [lmdb \| clang]	32m 50s
Linux [UBSAN] [lmdb \| clang]	38m 49s
macOS [ASAN] [lmdb \| clang]	31m 15s
Linux [ASAN] [lmdb \| clang]	39m 44s
macOS [TSAN] [lmdb \| clang]	33m 5s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	41m 24s
macOS [UBSAN] [rocksdb \| clang]	44m 17s
Linux [TSAN] [lmdb \| clang]	38m 50s
macOS [ASAN] [rocksdb \| clang]	42m 11s
Linux [LEAK] [lmdb \| clang]	38m 56s
macOS [TSAN] [rocksdb \| clang]	51m 22s
Linux [UBSAN] [rocksdb \| clang]	46m 43s
Linux [ASAN] [rocksdb \| clang]	55m 46s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	54m 40s
Linux [LEAK] [rocksdb \| clang]	56m 17s
	10h 46m 9s

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