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.

從 README 的 Client Transfer Protocol 區段和 Connection Parameters 表開始，其中引用了 client_protocol_version，但未列出該參數。與 maintainers 確認有效值，然後記錄該參數的型別、預設值、描述、有效值以及 Python 連線範例。表格和使用文件一致地涵蓋該參數即視為完成。

由索引模型根據 Issue 內容生成。