Bump version to v0.3.0
Bump version to v0.3.0

bitpay/bitcore,martindale/bitcore,bitjson/bitcore,bitpay/bitcore,bitpay/bitcore,martindale/bitcore,bitjson/bitcore,martindale/bitcore,bitpay/bitcore,bitjson/bitcore,martindale/bitcore,bitjson/bitcore