Fix: parse version object in block result

[vincentysc]

Example:

"consensus_param_updates": {
    "block": {
        "max_bytes": "1048576",
        "max_gas": "10000000"
    },
    "evidence": {
        "max_age_num_blocks": "403200",
        "max_age_duration": "2419200000000000",
        "max_bytes": "150000"
    },
    "validator": {
        "pub_key_types": [
            "ed25519"
        ]
    }
}