Stronglib

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* Drop support for Python 3.3, which is end of life.
* Officially support Python 3.6 and 3.7.
* Switch to the next version of the Strongarm API. This allows access to
blacklisted, whitelisted, and content filtered domains.
* A new filter() method is added to the Domain resource.
* The status (blacklisted, whitelisted, or filtered) of a domain is returned.
* The domain description can be added and viewed.
* The classification of infections is returned.

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* Fixed an exception when invalid JSON is returned from the Strongarm API. See
32. Thanks to kovacsbalu for reporting and fixing the issue.
* Update the default API host to point to DNSWatch.

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* update default API host

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* add support for Infection endpoint

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* remove duplicate entries when listing domains
* add a `count method` that exposes the number of unique domains

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* update API host to use https://strongarm.io
* update API endpoints to always have a trailing slash