change max_age condition to strictly smalled

Author: shaypal5

src/cachier/core.py

@@ -294,12 +294,12 @@ def _call(*args, max_age: Optional[timedelta] = None, **kwds):
             if _allow_none or entry.value is not None:
                 _print("Cached result found.")
                 now = datetime.now()
-                stale_delta = (
+                max_allowed_age = (
                     min(_stale_after, max_age)
                     if max_age is not None
                     else _stale_after
                 )
-                if now - entry.time <= stale_delta:
+                if now - entry.time < max_allowed_age:
                     _print("And it is fresh!")
                     return entry.value
                 _print("But it is stale... :(")