correct requirements

chatter/info.json

@@ -4,7 +4,7 @@
     "description" : "Create an offline chatbot that talks like your average member using Machine Learning",
     "hidden" : false,
     "install_msg" : "Thank you for installing Chatter!",
-    "requirements" : ["chatterbot"],
+    "requirements" : ["sqlalchemy<1.3,>=1.2", "python-twitter<4.0,>=3.0", "python-dateutil<2.7,>=2.6", "pymongo<4.0,>=3.3", "nltk<4.0,>=3.2", "mathparse<0.2,>=0.1", "chatterbot-corpus<1.2,>=1.1"],
     "short" : "Local Chatbot run on machine learning",
     "tags" : ["chat", "chatbot", "cleverbot", "clever","bobloy"]
 }