Did not implement the "getCode" with second parameters...

Only implement [DATA, 20 Bytes - address]
Did not implement: [QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter]

ex:
```
params: [
   '0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b',
   '0x2'  // 2
]
```