0.5.1 is a patch release that includes several bug fixes on top of 0.5.0:

• Handle aliased aggregate expressions by @jacksonrnewhouse in https://github.com/ArroyoSystems/arroyo/pull/263
• Improve scheduler cleanup robustness by @mwylde in https://github.com/ArroyoSystems/arroyo/pull/273
• Fix pipeline cleanup by @mwylde in https://github.com/ArroyoSystems/arroyo/pull/274
• Fix compilation for nested json schema fields by @mwylde in https://github.com/ArroyoSystems/arroyo/pull/278