Bing docs: Change `postalcode` to 'postalCode
@@ -102,7 +102,7 @@ class Bing(Geocoder):
For a structured query, provide a dictionary whose keys
are one of: `addressLine`, `locality` (city),
- `adminDistrict` (state), `countryRegion`, or `postalcode`.
+ `adminDistrict` (state), `countryRegion`, or `postalCode`.
:param bool exactly_one: Return one result or a list of results, if
available.
