v0.15.6

What's Changed

• feat: Implement Fluvio::connect_with_config, add FluvioConfig by @ozgrakkurt in #300
• doc: fix doc of Fluvio::connect by @ozgrakkurt in #301
• bump: bump version to prepare for release by @ozgrakkurt in #302

Full Changelog: v0.15.5...v0.15.6