Update to prompt-toolkit 0.52.

0.52 supports auto suggestions awslabs#28.  This same upgrade was done on SAWS, see pull request from jonathanslenders (author of prompt-toolkit): https://github.com/donnemartin/saws/pull/30/files.

Author: donnemartin

awsshell/app.py

@@ -92,6 +92,8 @@ def create_buffer(self, completer, history):
 
     def create_application(self, completer, history):
         key_bindings_registry = KeyBindingManager(
+            enable_search=True,
+            enable_abort_and_exit_bindings=True,
             enable_vi_mode=True,
             enable_system_bindings=False,
             enable_open_in_editor=False).registry
@@ -101,6 +103,7 @@ def create_application(self, completer, history):
 
         return Application(
             layout=self.create_layout(),
+            mouse_support=False,
             buffers=buffers,
             buffer=self.create_buffer(completer, history),
             on_abort=AbortAction.RAISE_EXCEPTION,

setup.py

@@ -7,7 +7,7 @@
 
 requires = [
     'awscli>=1.8.9,<2.0.0',
-    'prompt-toolkit==0.50',
+    'prompt-toolkit==0.52',
     'boto3>=1.2.1',
 ]