Remove reference to python3.10

Author: delfick

docs/index.rst

@@ -14,7 +14,7 @@
 Structures (strcs)
 ==================
 
-A Python3.10+ library that wraps `cattrs`_ for a modular
+A Python3.13+ library that wraps `cattrs`_ for a modular
 approach to constructing objects with the ability to string data through the process.
 
 Install from pypi::