Added sqlite database support, connect new argument parser to message handler

.env.example

@@ -11,6 +11,8 @@ TOKEN=
 # Put the database connection URL here
 # Example for MongoDB:
 # DB=mongodb://localhost:27017/esmBot
+# Example for SQLite:
+# DB=sqlite://data.sqlite
 # Example for PostgreSQL:
 DB=postgresql://esmbot:verycoolpass100@localhost:5432/esmbot