Log Message:
py-prompt_toolkit: updated to 3.0.18

3.0.18: 2021-03-22
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New features:
- Added `in_thread` parameter to `Application.run`.
  This is useful for running an application in a background thread, while the
  main thread blocks. This way, we are sure not to interfere with an event loop
  in the current thread. (This simplifies some code in ptpython and fixes an
  issue regarding leaking file descriptors due to not closing the event loop
  that was created in this background thread.)

3.0.17: 2021-03-11
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New features:
- Accept `style` parameter in `print_container` utility.
- On Windows, handle Control-Delete.

Fixes:
- Avoid leaking file descriptors in SSH server.

3.0.16: 2021-02-11
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New features:
- Added `ScrollablePane`: a scrollable layout container.
  This allows applications to build a layout, larger than the terminal, with a
  vertical scroll bar. The vertical scrolling will be done automatically when
  certain widgets receive the focus.
- Added `DeduplicateCompleter and `ConditionalCompleter`.
- Added `deduplicate` argument to `merge_completers`.