fix: license classifier

Author: Nick MacCarthy

setup.cfg

@@ -1,6 +1,7 @@
 [metadata]
 name = python-datemath 
 description = "A python module to emulate the date math used in SOLR and Elasticsearch"
+keywords = date math datemath elaticsearch solr
 long_description = file: README.md  
 long_description_content_type = text/markdown
 author = Nick MacCarthy
@@ -10,12 +11,17 @@ classifiers =
         Development Status :: 5 - Production/Stable        
         Intended Audience :: Developers
         Topic :: Software Development :: Build Tools
-        License :: Apache-2.0
+        License :: OSI Approved :: Apache License, Version 2.0 (Apache-2.0)
         Programming Language :: Python :: 3.8
         Programming Language :: Python :: 3.9
         Programming Language :: Python :: 3.10
         Programming Language :: Python :: 3.11
 
 
+[options]
+python_requires = >=3.8
+install_requires = 
+    arrow >= 1.0.3
+
 [bdist_wheel]
 universal=1