When setting up a new git clone for development, the standard
application.yml copied from application.example.yml gives a warning when
generating a secret or running other rake tasks:
```
➜ bx rake secret
WARNING: Use strings for Figaro configuration. true was converted to "true".
b8755cf41e3ed308780d39f4d3b0196a3fa34f311e233bc1f23770f237a6db898e5249cbf9d52deb029807d363dcfd0b7f36758859dd3e71a85e4a1053ba8479f
```
The value in the YML file was a boolean literal and Figaro expects (and
would get) strings from the environment so it was complaining.
Stringifying the value fixes the warning.
WARNING: Use strings for Figaro configuration. 587 was converted to "587".
WARNING: Use strings for Figaro configuration. true was converted to "true".
Harry Brundage