Fix to notifications property

Author: Nathan Lee

pyrunner/core/pyrunner.py

@@ -91,7 +91,7 @@ def notification(self):
     return self._notification
   @notification.setter
   def notification(self, o):
-    if not issubclass(o, Notification):
+    if not issubclass(type(o), Notification):
       raise TypeError('Not an extension of pyrunner.notification.Notification')
     self._notification = o
     return self

pyrunner/version.py

@@ -1 +1 @@
-__version__ = '5.2.0'
+__version__ = '5.2.1'