Fix the error where I couldn't register the same connector event twice

Author: sousa-andre

lcu_driver/events/managers.py

@@ -17,7 +17,7 @@ def handlers(self):
 
     def _set_event(self, event_name, func_or_coro: Union[Callable, Awaitable]):
         if event_name in self._handlers:
-            self.handlers[event_name] += func_or_coro
+            self.handlers[event_name].append(func_or_coro)
         else:
             self.handlers[event_name] = [func_or_coro, ]
         return self.handlers[event_name][-1]

setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup
 
-__version__ = '2.1.2'
+__version__ = '2.1.3'
 
 with open('README.md', encoding='utf-8') as f:
     long_description = f.read()