Fix dev status to 4

Author: bobleesj

pyproject.toml

@@ -16,7 +16,7 @@ keywords = ['diffpy', 'PDF']
 readme = "README.rst"
 requires-python = ">=3.10"
 classifiers = [
-        'Development Status :: 5 - Production/Stable',
+        'Development Status :: 4 - Beta',
         'Environment :: Console',
         'Intended Audience :: Developers',
         'Intended Audience :: Science/Research',