the AioClient has an exceptiion with call range() function

[boylegu]

• etcd3-py version: 0.1.6
• Python version: 3.6.8
• Operating System: osx 10.13.6

Description

the AioClient has an exceptiion with call range() function
As follows：

What I Did

import asyncio
from etcd3 import AioClient

client = AioClient()

async def AsyncFunc():
    r = await client.range('foo')
    print('key:', r.kvs[0].key, 'value:', r.kvs[0].value)

loop = asyncio.get_event_loop()
loop.run_until_complete(AsyncFunc())

==============================

Traceback (most recent call last):
  File "/xxxxxx/srv/etcddemo.py", line 4, in <module>
    Aclient = AioClient()
  File "/Users/pyvers/py3.6.8_health_env/lib/python3.6/site-packages/etcd3_py-0.1.6-py3.6.egg/etcd3/aio_client.py", line 177, in __init__
    connector = aiohttp.TCPConnector(limit=pool_size, ssl=self.ssl_context)
  File "/Users/pyvers/py3.6.8_health_env/lib/python3.6/site-packages/aiohttp-4.0.0a1-py3.6-macosx-10.13-x86_64.egg/aiohttp/connector.py", line 711, in __init__
    enable_cleanup_closed=enable_cleanup_closed)
  File "/Users/pyvers/py3.6.8_health_env/lib/python3.6/site-packages/aiohttp-4.0.0a1-py3.6-macosx-10.13-x86_64.egg/aiohttp/connector.py", line 207, in __init__
    loop = get_running_loop()
  File "/Users/pyvers/py3.6.8_health_env/lib/python3.6/site-packages/aiohttp-4.0.0a1-py3.6-macosx-10.13-x86_64.egg/aiohttp/helpers.py", line 276, in get_running_loop
    raise RuntimeError("The object should be created from async function")
RuntimeError: The object should be created from async function

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[Revolution1]

It seems to be a breaking change of aiohttp

aio-libs/aiohttp#3331

I'll try to fix it.

Don't know why you are using the 'alpha1' version of aiohttp.