Support for goerli network

[emil14]

dydx/starkex moved to goerli network. Current starkex package doesn't support it. Is it possible to add such support?

	orderSignParam := starkex.OrderSignParam{
		NetworkId: 5, // dydx testnet
                // ...
	}

	signature, err := starkex.OrderSign(starkexCredsPrivateKey, orderSignParam)
	if err != nil {
		return err // <- here
	}

This is the source of error - https://github.com/yanue/starkex/blob/master/sign_order.go#L36

[yanue]

just check this: 5c922d2
but I don't know if it works or not.

[emil14]

but the problem is in COLLATERAL_ASSET_ID_BY_NETWORK_ID map, not ASSET_RESOLUTION