fix: Adds Mongo reconnections. (#66)

Author: ryasmi

.env.example

@@ -9,6 +9,7 @@
 
 # Mongo connection string (e.g. mongodb://localhost:27017/xapiservice)
 MONGO_URL=mongodb://localhost:27017/learninglocker_v2
+MONGO_DB=learninglocker_v2
 
 #########
 # Redis #