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Kani

Add reference to book, remove ethereum reference #309

Job	Run time
Proof unit tests (order-book)	15s
Proof unit tests (lending)	12s
Proof unit tests (fundraiser)	14s
Proof unit tests (betting-market)	18s
Proof unit tests (prop-amm)	14s
Proof unit tests (managed-fund)	15s
Proof unit tests (escrow)	18s
Proof unit tests (token-swap)	14s
Proof unit tests (options)	16s
Kani proofs (${{ matrix.program }})	0s
	2m 16s