uvloop: Pass loop to aiohttp to fix backend "uvloop"

Backtrace was:

Traceback (most recent call last):
  File "[..]/lib/python3.6/site-packages/aiohttp/server.py", line 239, in start
    httpstream = reader.set_parser(self._request_parser)
  File "[..]/lib/python3.6/site-packages/aiohttp/parsers.py", line 199, in set_parser
    self.unset_parser()
  File "[..]/lib/python3.6/site-packages/aiohttp/parsers.py", line 209, in unset_parser
    if self._loop.is_closed():
AttributeError: 'NoneType' object has no attribute 'is_closed'

1 files changed, 1 insertions, 0 deletions

diff --git a/bottle.py b/bottle.py
index f53fe7e..cc42077 100755
--- a/bottle.py
+++ b/bottle.py
@@ -3525,6 +3525,7 @@ class AiohttpServer(AsyncioServerAdapter):
         protocol_factory = lambda: WSGIServerHttpProtocol(
             handler,
             readpayload=True,
+            loop=self.loop,
             debug=(not self.quiet))
         self.loop.run_until_complete(self.loop.create_server(protocol_factory,
                                                              self.host,