mapbox / mapbox-sdk-py / 1450

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Pull #278

travis-ci

fix(mapbox/utils): make collections import future-proof

Python 3.9 will make the `collections` import to stop working. This changes the default import
for Python 3+ to use `collections.abc` instead.
Note that it was deliberate to _not_ inspect the exact Python 3 version (`collections.abc` was
introduced on Python 3.3) - the assumption made was that the minimum Python 3 version supported
was 3.6, found in the `tox` configuration.

Other changes:

- Update `CONTRIBUTING` guidelines to use quotes so that it plays nicely with other shells (zsh,
  for example)
- Include Python 3.7 and 3.8 to the `tox.ini` configuration so that the existing test suite is
  checked for potential compatibility issues caused by the change of imported module.

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