change bcoin dependency to 1.0.0-beta.12
change bcoin dependency to 1.0.0-beta.12

bitjson/bitcore,bitpay/bitcore,martindale/bitcore,bitpay/bitcore,bitjson/bitcore,martindale/bitcore,bitjson/bitcore,bitpay/bitcore-p2p,bitjson/bitcore,martindale/bitcore,bitpay/bitcore,bitpay/bitcore,martindale/bitcore