添加粉丝团信息，补充下播消息用法

messages/fansclub.py

@@ -0,0 +1,17 @@
+import time
+
+from protobuf import message_pb2
+from messages.base import Base
+
+class FansclubMessage(Base):
+    def __init__(self):
+        self.instance = message_pb2.FansclubMessage()
+
+    def format_content(self):
+        return self.instance.content
+
+    def __str__(self):
+        if self.instance.type == 1:
+            return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) + '【加入粉丝团】' +  self.format_content()
+        elif self.instance.type == 2:
+            return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) + '【粉丝牌升级】' +  self.format_content()