Shouldn't export greet

[SyxP]

In my opinion, you shouldn't need to export greet in this package. (You can of course do whatever you want)

BrazilCentralBank.jl/src/BrazilCentralBank.jl

Line 15 in 7190742

export greet

[azeredo-e]

I thought it was a fun little thing to left on, but yeah, I guess I should not export and just left for access directly through calling the name of the module.

I'm removing the export.

Thanks for the advice!