0.3.0 (2016-08-12)

The updater is no longer a genserver but a recursive call which is started and linked by the cache
Cache can now return a cache age and the updater will properly honer th cache time.
When starting the app, it will check the cache age of the cache file, and use that if its still valid, otherwise do a direct update
Added bang methods
Added methods to return a formatted currency string

0.2.0 (2016-08-08)

OpenExchangeRates.rate_for_currency/1 is now OpenExchangeRates.conversion_rate/2
Config now accepts two new settings
- cache_file: "/path/to/cache.json"
- auto_update: true
Supervisor now is a one_for_all, in stead of one_for_one, this makes sure that the updater and cache are linked to each other.
bumped Credo version