chore: add otel 0.30 support in readme #57

Job	Run time
misc check	4s
rust machete check	53s
rust ffmt check (ubuntu-latest)	20s
rust ffmt check (windows-latest)	1m 51s
rust test with codecov (windows-latest, stable)	2m 27s
rust ffmt check (macos-latest)	19s
rust doc test (ubuntu-latest)	30s
rust doc test (windows-latest)	1m 41s
rust test with codecov (macos-latest, stable)	59s
rust test with codecov (ubuntu-latest, stable)	1m 15s
rust doc test (macos-latest)	35s
	10m 54s

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