Add back addons

app.json

@@ -50,10 +50,6 @@
         "description": "Whether to use Service Accounts or not. For this to work see 'Using Service Accounts' in repo.",
         "required": false
       },
-      "DATABASE_URL": {
-        "description": "Your Database URL. See in repo to generate database.",
-        "required": false
-      },
       "AUTHORIZED_CHATS": {
         "description": "Fill User ID and Chat ID of you want to authorize, Seprate them with space.",
         "required": false
@@ -209,6 +205,11 @@
         "required": false
       }
     },
+    "addons": [
+      {
+        "plan": "heroku-postgresql"
+      }
+    ],
     "formation": {
             "worker": {
                 "quantity": 1,