Add build-json script

lib/addresses/Contributors.json

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+{}

lib/addresses/Operator.json

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+{}

lib/addresses/Registry.json

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+{"1522420467868":"0x6dee5ccedef4e55ee7c58f1e7962172292664b59"}

lib/addresses/Token.json

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+{"1522420467868":"0xe9bcdf2736a3b1b33b806f306cd6de05f9d7f33a"}