Updated dockerfile and added misssing requirement

Author: Seluj78

backend/requirements.txt

@@ -39,4 +39,6 @@ randomuser==1.6
 pyimgur==0.6.0
 Pillow==8.0.1
 
-timeago==1.0.14
+timeago==1.0.14
+
+chatterbot==1.1.0

workers.Dockerfile

@@ -7,4 +7,4 @@ ENV PYTHONDONTWRITEBYTECODE 1
 EXPOSE 5000
 ADD .env .
 RUN export $(cat .env | xargs)
-CMD celery -A PyMatcha.celery worker --concurrency=1 -E --loglevel=INFO -B
+CMD celery -A PyMatcha.celery worker -E --loglevel=INFO -B --pool=threads