upgrader

type Upgrade struct {
	UpgradeName string
	Configs     []*UpgradeConfig
}

type UpgradeConfig struct {
	ContractAddr       types.Address
	CommitURL          string
	Code               string
	DefaultInitStorage map[types.Hash]types.Hash  // the initial storage must be backward compatible
	Rebalance          map[types.Address]*big.Int // deprecated, only active in test network
}