Broken support for Python 3.5

[wdhorton]

Environment details

googlemaps 4.7.0
Python 3.5 on Ubuntu

Steps to reproduce

Code example

import googlemaps

Stack trace

../dags/lib/utils.py:3: in <module>
   import googlemaps
../../../miniconda/envs/metropolis_airflow/lib/python3.5/site-packages/googlemaps/__init__.py:20: in <module>
   from googlemaps.client import Client
E     File "/home/circleci/miniconda/envs/metropolis_airflow/lib/python3.5/site-packages/googlemaps/client.py", line 180
E       self.queries_quota : int
E                          ^
E   SyntaxError: invalid syntax

I can see that this line was introduced recently in this PR: #448

[amuramoto]

Working on fixing this in #453

[amuramoto]

Fixed in #453