Remove chatterbot as a requirement, install manually

chatter/info.json

@@ -22,8 +22,7 @@
     "spacy>=2.3,<2.4",
     "https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-2.3.1/en_core_web_sm-2.3.1.tar.gz#egg=en_core_web_sm",
     "https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-2.3.1/en_core_web_sm-2.3.1.tar.gz#egg=en_core_web_md",
-    "https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-2.3.1/en_core_web_sm-2.3.1.tar.gz#egg=en_core_web_lg",
-    "chatterbot>=1.1"
+    "https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-2.3.1/en_core_web_sm-2.3.1.tar.gz#egg=en_core_web_lg"
   ],
   "short": "Local Chatbot run on machine learning",
   "tags": [