Fixing flake8 linting errors

- Enabling builds to fail on simple lint failures now

examples/async_ssl_server.py

@@ -52,7 +52,6 @@ class Server:
         logger.debug("myreader done.")
         return True
 
-
     async def mywriter(self):
         while self.retry:
             try:
@@ -71,7 +70,6 @@ class Server:
         logger.debug("mywriter done.")
         return True
 
-
     async def myserver(self, reader, writer):
         # Start TwoPartyServer using TwoWayPipe (only requires bootstrap)
         self.server = capnp.TwoPartyServer(bootstrap=ExampleImpl())