**Fixing bugs**:

- When `explorer` and `chain_id` keys were not set in `NetworkInfo`, it was impossible to create a wallet
- Method `is_native_token` doesn`t work with `ERC20Token` instance

**Fixing bugs**:

- When `explorer` and `chain_id` keys were not set in `NetworkInfo`, it was impossible to create a wallet
- Method `is_native_token` doesn`t work with `ERC20Token` instance

Removing websocket usage.

Release of 2.0.0 version. Here are fixing synchronous version of `Wal…

…let`. Removing method `get_transactions`. Adding method `get_token`, returning `ERC20Token` instance, that is now used instead token addresses as argument in methods. Renaming method `build_transaction_params` to `build_tx_params`. Replacing RPCs with more fast. Replacing `NETWORK_MAP` in `globals.py` with static attribute in Wallet classes

Adding methods get_balance_of(), get_decimal(). Adding option to_wei …

…to get_balance()

Fixing method get_explorer_url()

Updating method build_transaction_params: adding possibility to set r…

…aw_data. Fixing method get_transactions: from now it's synchronous in both implementations. Fixing method build_and_transact.

Little changes in __init__.py

Fixing method is_native_token

Adding possibility to set recipient in build_transaction_params