feat: add default timout to cache_memoize (#68)

In some cases, you do not want to specify the timout for all the
definitions and want the method to use the django defult cache timeout
instead.

Author: EmberCraze

src/cache_memoize/__init__.py

@@ -8,14 +8,15 @@
 
 from django.db import models
 from django.core.cache import caches, DEFAULT_CACHE_ALIAS
+from django.core.cache.backends.base import DEFAULT_TIMEOUT
 
 from django.utils.encoding import force_bytes
 
 MARKER = object()
 
 
 def cache_memoize(
-    timeout,
+    timeout=DEFAULT_TIMEOUT,
     prefix=None,
     extra=None,
     args_rewrite=None,