chore(version): update pivot version to 0.3.0.dev0

Author: vbabich

plugins/pivot/setup.cfg

@@ -3,7 +3,7 @@ name = deephaven-plugin-pivot
 description = Deephaven Pivot Plugin
 long_description = file: README.md
 long_description_content_type = text/markdown
-version = 0.3.0
+version = 0.3.0.dev0
 keywords = deephaven, plugin, graph
 author = Deephaven
 author_email = vladbabich@deephaven.io