This removes the deprecation warning:
```
[WARNING] The default currency will change from `USD` to `nil` in the
next major release. Make sure to set it explicitly using
`Money.default_currency=` to avoid potential issues
```
This removes the deprecation warning:
```
[WARNING] The default rounding mode will change from `ROUND_HALF_EVEN`
to `ROUND_HALF_UP` in the next major release. Set it explicitly using
`Money.rounding_mode=` to avoid potential problems.
```
by specifying the default rounding mode at boot time so that it's only
set once for the whole app. See
https://github.com/RubyMoney/money#rounding for details.
