v0.5

1. New feature with fix rngseed setting to get idenditical sql generated.
2. Bugfixes for logging and cleaned up some codes.

What's Changed

• Improvment by @RyanWei in #13
• change some GUC settings by @RyanWei in #14
• bug fix for logging by @RyanWei in #15
• Clean up uncessary code and functions. by @RyanWei in #16
• Add features to use same rndseed for query generations. by @RyanWei in #17

Full Changelog: v0.4...v0.5