Applying black formatting

- Fixing flake8 configuration to agree with black
- Adding black validation check to github actions

examples/thread_client.py

@@ -12,8 +12,10 @@ capnp.create_event_loop(threaded=True)
 
 
 def parse_args():
-    parser = argparse.ArgumentParser(usage='Connects to the Example thread server \
-at the given address and does some RPCs')
+    parser = argparse.ArgumentParser(
+        usage="Connects to the Example thread server \
+at the given address and does some RPCs"
+    )
     parser.add_argument("host", help="HOST:PORT")
 
     return parser.parse_args()
@@ -21,10 +23,10 @@ at the given address and does some RPCs')
 
 class StatusSubscriber(thread_capnp.Example.StatusSubscriber.Server):
 
-    '''An implementation of the StatusSubscriber interface'''
+    """An implementation of the StatusSubscriber interface"""
 
     def status(self, value, **kwargs):
-        print('status: {}'.format(time.time()))
+        print("status: {}".format(time.time()))
 
 
 def start_status_thread(host):
@@ -44,14 +46,14 @@ def main(host):
     status_thread.daemon = True
     status_thread.start()
 
-    print('main: {}'.format(time.time()))
+    print("main: {}".format(time.time()))
     cap.longRunning().wait()
-    print('main: {}'.format(time.time()))
+    print("main: {}".format(time.time()))
     cap.longRunning().wait()
-    print('main: {}'.format(time.time()))
+    print("main: {}".format(time.time()))
     cap.longRunning().wait()
-    print('main: {}'.format(time.time()))
+    print("main: {}".format(time.time()))
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main(parse_args().host)