docs: client_protocol_version missing from Connection Parameters table

The README references client_protocol_version under "Client Transfer Protocol," stating it can modify the protocol version. However, this parameter is:

1. Absent from the Connection Parameters table


2. Has no usage example or valid values documented

Suggested addition to the parameters table:

Parameter | Type | Default | Description
-- | -- | -- | --
client_protocol_version | int | 2 | Controls the wire protocol version for data transfer

Example:

conn = redshift_connector.connect(

    host='cluster.abc123.us-east-1.redshift.amazonaws.com',

    database='dev',

    user='admin',

    password='***',

    client_protocol_version=2

)

Happy to open a PR if maintainers can confirm the valid values.

Start in the README's Client Transfer Protocol section and Connection Parameters table, where client_protocol_version is referenced but not listed. Confirm the valid values with maintainers, then document the parameter's type, default, description, valid values, and Python connection example. Done means the table and usage documentation consistently cover the parameter.

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