Bump version to 0.3

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: chekos

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "uv_build"
 
 [project]
 name = "pypums"
-version = "0.2"
+version = "0.3"
 description = "Python interface to the US Census Bureau API for ACS, Decennial Census, PUMS, population estimates, and migration flows."
 readme = "README.md"
 license = "Apache-2.0"