- [fix](cdr) split the insert and the function plpgsql call
- [fix](cdr) refactor remove fields hangup_cause, used_gateway_id from CDR
- [fix](cdr) get rid of disposition field in dialer_cdr
- smaller changes: improve test suits, add pool_size, etc...
Last version working with disposition
- adding credo, clean-up code base, fix tests
- add pool_size for ecto