NebulaGraph Python client v3.4.0

What's Changed

Bug fixes:

• fix session._connection none error by @liuxiaocs7 in #250
• Remove unusable connection if connection Ping() failed by @Aiee in #255

Others:

• Enable action for release branches by @Aiee in #234
• add coverage by @HarrisChu in #235
• add auto label by @HarrisChu in #243
• Set lower bound version for install requirements by @greyli in #155
• fix readme by @HarrisChu in #256
• Replace the protocol with header protocol by @Aiee in #254

New Contributors

• @liuxiaocs7 made their first contribution in #250

Full Changelog: 3.3.0...v3.4.0