V0.2.0-beta

WARNING : This version is a beta version.

Enhancements

• Statefull processors (COUNT, AGGREGATE, REDUCE, WINDOWED) (docs)
• HoppingWindowOptions & TumblingWindowOptions
• Add GetWindowStore(...) method to Topology test driver (code)
• Getting ReadOnlyWindowStore to stream instance
• InMemoryWindowStore to materialize windowing KTable (docs)
• Add GlobalKTable in StreamBuilder definition @mmoron

Thanks to @mmoron for their contribution to this release.