Add Twitter integration

Fixes #46

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3'
+version: "3"
 volumes:
   postgres-data:
   static-files:
@@ -16,7 +16,7 @@ services:
   rabbitmq:
     image: rabbitmq:3.7
   memcached:
-    image: memcached:1.5.22
+    image: memcached:1.6
     ports:
       - "11211:11211"
     entrypoint:
@@ -31,6 +31,7 @@ services:
       - DJANGO_SETTINGS_MODULE=newsreader.conf.docker
     depends_on:
       - rabbitmq
+      - memcached
     volumes:
       - .:/app
   django:
@@ -41,9 +42,10 @@ services:
     environment:
       - DJANGO_SETTINGS_MODULE=newsreader.conf.docker
     ports:
-      - '8000:8000'
+      - "8000:8000"
     depends_on:
       - db
+      - memcached
     volumes:
       - .:/app
       - static-files:/app/src/newsreader/static