Asynch

- Support json column. (73)
- Fix connection with `secure=True` and `verify=False`.
- Fix compression.
- Fix exception `Cannot set verify_mode to CERT_NONE when check_hostname is enabled`.

- Add `Int128Column`, `Int256Column`, `UInt128Column`, `UInt256Column`, `Decimal256Column`. (57)
- Add Geo type support. (56)
- Add decimals in map support. (55)
- Add `NestedColumn`. (54)
- Add execution_options support. (53)
- Fix `IPv6Column`. (52)
- Fix execution context exception handling. (51)
- Fix stream_mode. (44)
- Fix `SimpleAggregateFunction` for nested. (41)

- Fix ping message for unstable network. (48)

- Fix compression not working. (36)
- Add `BoolColumn`. (38)

- Fix LowCardinalityColumn keys column exception. (17)