Geocoder

**[See on Pypi](https://pypi.python.org/pypi/geocoder/1.32.1) - PR [289](https://github.com/DenisCarriere/geocoder/pull/289) & PR [293](https://github.com/DenisCarriere/geocoder/pull/293) - (coverage 86%)**

* added coverage badge on README
* improved test coverage calling debug in majority of providers
* fixed debug() function to be compatible with python 2.7
* fixed all providers parsing on geocode method: no errors if some fields are not found in the JSON
* restaured backward compatibility: no errors when trying to access data on a result which is not OK

**[See on Pypi](https://pypi.python.org/pypi/geocoder/1.32.0) - PR [288](https://github.com/DenisCarriere/geocoder/pull/288) - (coverage 83%)**

- added pretty 'header' in README.md
- added Changelog (this file)
- refactored canadapost, moving key getter in keys.py
- refactored mapzen
- refactored ottawa
- refactored tomtom
- refactored yandex
- refactored tgos
- refactored opencage
- refactored maxmind
- refactored komoot
- refactored yahoo
- refactored baidu
- refactored gaode
- fixed `base.py: MultipleResultsQuery._catch_errors` which was not returning errors most of the time
- fixed issue 207: tomtom, making use of new API

**[See on Pypi](https://pypi.python.org/pypi/geocoder/1.31.0) - [PR 286](https://github.com/DenisCarriere/geocoder/pull/286) - (coverage 73%)**

- added class attribute `_KEY_MANDATORY` [default to True]
- refactored freegeoip, also changed url
- refactored geocodefarm
- refactored ipinfo
- refactored geolytica
- refactored here
- refactored tamu
- fixed with PR 287: Allow tamu requests without zip code
- fixed issue 215: Unofficial endpoint for FreeGeoIP causes intermittent errors

**[See on Pypi](https://pypi.python.org/pypi/geocoder/1.30.1)**

- refactored w3w
- refactored ipinfo
- refactored arcgis
- refactored osm
- fixed issue 154: Add ArcGIS Reverse geocoding
- fixed issue 279: Google client keys don't get picked up
- fixed issue 282: Accuracy is always None in 1.29.1 with Google Geocode
- fixed issue 260: updating what3words provider to use API v2

**[See on Pypi](https://pypi.python.org/pypi/geocoder/1.29.1)**

- added refactoring guide
- fixed issue 276: Opencage geocoder circular lookup for Town

**[See on Pypi](https://pypi.python.org/pypi/geocoder/1.28.0)**

- added Baidu reverse and Gaode providers (old style)