Hardcoded Protocol Version

[fedekunze]

Acceptance Criteria: Hard code protocol version until we fix build issues. Create follow up issue to fix build issues.

Note: issue with Cgo during build process when importing Ethereum package

The protocol version is currently hardcoded on the version package.

// ProtocolVersion is the supported Ethereum protocol version (e.g., Homestead, Olympic, etc.)
const ProtocolVersion = 63

The current supported protocol versions from geth are:

// Constants to match up protocol versions and messages
const (
	eth63 = 63
	eth64 = 64
	eth65 = 65
)