* ADDED: Photon geocoder. Contributed by mthh.

* ADDED: Bing supports structured query parameters. Contributed by
    SemiNormal.

* CHANGED: Geocoders send a `User-Agent` header, which by default is
    `geopy/1.11.0`. Configure it during geocoder initialization. Contributed
    by sebastianneubauer.

* FIXED: Index out of range error with no results using Yandex. Contributed
    by facciocose.

* FIXED: Nominatim was incorrectly sending `view_box` when not requested,
    and formatting it incorrectly. Contributed by m0zes.