Ensure the client is closed when closing the connection.

[ioquatix]

When returning a single connection object, decorate it so that calling close also closes the underlying client.

Fixes #46.

Types of Changes

• Bug fix.

Contribution

• [x] I added tests for my changes.
• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.