Not all of these releases were tagged on GitHub and none of them have release notes on GitHub. Releases prior to 0.5.0 were not documented (although some were tagged on GitHub).
How to Profile PySpark Debugging with the Apache Spark UI Spark UI Simulator Spill Listener - Spark UI Salt Join - Spark UI Hive UDF for legacy pre-Spark SQL conversions Syntax, Partitioning Join & ...