* Added: cached reponse for GoogleMaps provider (tests)

* Added: `ProviderAggregator` (replacing the former `Geocoder` class)

* Added: ability to change providers locale at runtime

* Documentation: almost entirely rewritten

* Documentation: a note on versioning has been added

* Documentation: a Contributor Code of Conduct has been added for the entire

Geocoder project

* Fixed: phpdoc, wording

* Fixed: providers are now highly configurable, even at runtime

* Fixed: `FreeGeoIp` property because of an API change

* Moved: IGN OpenLS provider to geocoder-extra (#339)

* Moved: OIORest provider to geocoder-extra (#336)

* Moved: GeoCoder.us provider to geocoder-extra (#338)

* Moved: GeoCoder.ca provider to geocoder-extra (#337)

* Moved: DataScienceToolkit provider to geocoder-extra (#340)

* Moved: Baidu provider to geocoder-extra (#341)

* Moved: IpGeoBase provider to geocoder-extra (#342)

* Renamed: properties such as:

- city => locality

- cityDistrict => subLocality

- zipcode => postalCode

* Refactored: dumpers (remove Interface suffix, define a new method signature)

* Refactored: class names!

* Refactored: all providers now implement the `Geocoder` interface

* Refactored: exception messages are a bit more verbose

* Removed: `Provider`, `Dumper`, `Interface`, and `Exception` suffixes

* Removed: `autoload.php` file

* Removed: `OpenStreetMapsProvider` class (#335)