Add the option to set the currency prefix.

[picheli20]

Nowadays its not possible to make the configuration of the currency prefix. Will be nice to be able to setup, not just the default.

[coveralls]

Changes Unknown when pulling fb45b4c on picheli20:patch-1 into * on assisrafael:master*.

[assisrafael]

Thank you for the pull request.
Before merging, your code need to pass the CI.

[picheli20]

Sorry Rafael,
Here in my work i'm not able to test property the code. I think now its passing.

[coveralls]

Changes Unknown when pulling c051792 on picheli20:patch-1 into * on assisrafael:master*.

[picheli20]

I created the test but idk how to include on this issue.

This is the commit 073af5a

[assisrafael]

I don't kwow either. Try to redo the test commit into the pull request branch in your fork.

[coveralls]

Changes Unknown when pulling 08e95a6 on picheli20:patch-1 into * on assisrafael:master*.