modify async to async_mode to support python3.7

[farmercode]

support python3.7

[PhillipPeterson]

Since you were already on supporting 3.7 is it doable to add 3.7 that to the travis ci file?

[farmercode]

I'm new to continuous integration,I add py3.7-dev to travis ci file!And the test passed! Is this ok?

[PhillipPeterson]

I'm new to it as well! With all the tests passing I think it's good, thank you!

[vinsec]

of course it wasn't a total replacement in #803 ,I pulled a request and replaced the rest args but failed in travis checks.At least, there is all ok now in my server with python 3.7.

[gitfourteen]

Problem still exits. macOS Catalina, Python 3.7.5, pipenv
Tried to replace with async with something likeaync_spider. It seem an endless job and errors popping out again and again. First time to use PySpider...

Finally got this.

``` [W 191125 16:51:27 run:413] phantomjs not found, continue running without it. [I 191125 16:51:29 result_worker:49] result_worker starting... [I 191125 16:51:30 scheduler:647] scheduler starting... [I 191125 16:51:30 processor:211] processor starting... [I 191125 16:51:30 scheduler:782] scheduler.xmlrpc listening on 127.0.0.1:23333 [I 191125 16:51:30 scheduler:586] in 5m: new:0,success:0,retry:0,failed:0 [I 191125 16:51:31 tornado_fetcher:638] fetcher starting... [I 191125 16:51:31 app:84] webui exiting... Traceback (most recent call last): File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/bin/pyspider", line 8, in sys.exit(main()) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/pyspider/run.py", line 754, in main cli() File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 764, in __call__ return self.main(*args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 717, in main rv = self.invoke(ctx) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 1114, in invoke return Command.invoke(self, ctx) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 956, in invoke return ctx.invoke(self.callback, **ctx.params) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 555, in invoke return callback(*args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/pyspider/run.py", line 165, in cli ctx.invoke(all) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 555, in invoke return callback(*args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/pyspider/run.py", line 497, in all ctx.invoke(webui, **webui_config) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/core.py", line 555, in invoke return callback(*args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/click/decorators.py", line 17, in new_func return f(get_current_context(), *args, **kwargs) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/pyspider/run.py", line 384, in webui app.run(host=host, port=port) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/pyspider/webui/app.py", line 59, in run from .webdav import dav_app File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/pyspider/webui/webdav.py", line 216, in dav_app = WsgiDAVApp(config) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/wsgidav/wsgidav_app.py", line 134, in __init__ _check_config(config) File "/Users/rindt/.local/share/virtualenvs/PySpider-Hw_U5HLL/lib/python3.7/site-packages/wsgidav/wsgidav_app.py", line 118, in _check_config raise ValueError("Invalid configuration:\n - " + "\n - ".join(errors)) ValueError: Invalid configuration: - Deprecated option 'domaincontroller': use 'http_authenticator.domain_controller' instead. ```

And addressed above issue following this solution