Does not work under Ubuntu 16.04 with Python 3.5.1

Ubuntu 16.04 by default ships with Python 3.5.1 that has a typing library that does not provide Coroutine typing definition. This was fixed in Python 3.5.2 (python/typing#119) but afaik Ubuntu does not ship the fixed version.

Running the first example in the readme gives this output:

Traceback (most recent call last):
  File "./main.py", line 15, in <module>
    from aiorun import run
  File "/tmp/scratch/venv/lib/python3.5/site-packages/aiorun.py", line 14, in <module>
    from typing import Optional, Coroutine, Callable
ImportError: cannot import name 'Coroutine'

Im currently using this ugly hack and typing library from pip but a better solution should be figgured out.

# Ubuntu 16.04 ships with broken typing lib
# change sys path to use typing lib in virtualenv
if sys.version_info[:3] < (3, 5, 2):
    old_syspath = sys.path
    sys.path.insert(0, sys.path[-1])
    from aiorun import run
    sys.path = old_syspath
else:
    from aiorun import run

[cjrh]

@artizirk The fix in #10 has now been push in aiorun==2018.4.1. Sorry I took so long to finalize this. Thanks again for reporting!

[artizirk]

Putting Coroutine import behind a version check should fix it.