Enhance airdrop claim examples in README #116

Job	Run time
basic-operations/anchor/create-nullifier	4m 18s
basic-operations/anchor/burn	4m 17s
basic-operations/anchor/update	4m 18s
create-and-update	4m 18s
basic-operations/anchor/create	4m 18s
counter/anchor	4m 18s
basic-operations/anchor/reinit	4m 17s
basic-operations/anchor/close	4m 18s
	34m 22s

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