Use py-gtfs-loader from PyPI instead of git dependency (#46)

Switch from git+https://github.com/transitapp/[email protected] to py-gtfs-loader>=0.3.1 from PyPI to enable deployment to PyPI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <[email protected]>

Author: gcamp

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "GTFS-flex-to-GOFS"
-version = "0.5.0"
+version = "0.5.1"
 description = "Convert GTFS Flex to GOFS"
 readme = "README.md"
 license = {text = "MIT"}
@@ -16,9 +16,9 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 dependencies = [
-    "py-gtfs-loader @ git+https://github.com/transitapp/[email protected]",
+    "py-gtfs-loader>=0.3.1",
     "shapely>=2.0.4"
 ]