Pypollencom

* Remove aiodns from requirements

* Add runtime support for Python 3.5.3 (8)

* Add support for getting current asthma info (7)

* Add asthma endpoints (6)

* Updated CI pipeline
* Moved documentation from RST to Markdown
* Made Python 3.6 the minimum version

* Raise an `InvalidZipError` when no good data is returned.
* Raise an `InvalidZipError` when a call to `allergens.outlook()` returns a 404.