Update prompt-toolkit to 3.0.19

[pyup-bot]

This PR updates prompt-toolkit from 3.0.7 to 3.0.19.

Changelog

3.0.19

------------------

Fixes:
- Make the flush method of the vt100 output implementation re-entrant (fixes an
issue when using aiogevent).
- Fix off-by-one in `FormattedTextControl` mouse logic.
- Run `print_container` always in a thread (avoid interfering with possible
event loop).
- Make sphinx autodoc generation platform agnostic (don't import Windows stuff
when generating Sphinx docs).

3.0.18

------------------

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

------------------

Fixes:
- Fix leaking file descriptors due to not closing the asyncio event loop after
reading input in a thread.
- Fix race condition during retrieval of signatures.

3.0.16

------------------

(Commit 7f619e was missing in previous release.)

Fixes:
- Several fixes to the completion code:
* Give dictionary completions priority over path completions.
* Always call non-fuzzy completer after fuzzy completer to prevent that some
 completions were missed out if the fuzzy completer doesn't find them.

3.0.15

------------------

New features:
- When pressing control-w, only delete characters until a punctuation.

Fixes:
- Fix `AttributeError` during retrieval of signatures with type annotations.

3.0.14

------------------

New features:
- Display of signature and completion drop down together.
- If `DictionaryCompleter` is enabled, also retrieve signatures when Jedi
fails, using the same logic.
- List function parameters first and private attributes at the end in the
completion menu.
- Cleanup of the completion code.

Fixes:
- Handle exceptions raised when `repr()` is called.
- Fix leakage of `exc_info` from eval to exec call.
- Fix handling of `KeyboardInterrupt` in REPL during evaluation of `__repr__`.
- Fix style for signature toolbar.
- Hide signature when sidebar is visible.

3.0.13

------------------

New features:
- Added 'print all' option to pager.
- Improve handling of indented code:
* Allow multiline input to be indented as a whole (we will unindent before
 executing).
* Correctly visualize tabs (instead of ^I, which happens when pasted in
 bracketed paste).

Fixes:
- Fix line ending bug in pager.

3.0.12

------------------

New features:
- Expose a `get_ptpython` function in the global namespace, to get programmatic
access to the REPL.
- Expose `embed()` at the top level of the package. Make it possible to do
`from ptpython import embed`.

Fixes:
- Properly handle exceptions when trying to access `__pt_repr__`.
- Properly handle `SystemExit`.

3.0.11

------------------

New features:
- Add support for top-level await.
- Refactoring of event loop usage:

* The ptpython input UI will now run in a separate thread. This makes it
 possible to properly embed ptpython in an asyncio application, without
 having to deal with nested event loops (which asyncio does not support).

* The "eval" part doesn't anymore take place within a ptpython coroutine, so
 it can spawn its own loop if needed. This also fixes `asyncio.run()` usage
 in the REPL, which was broken before.

- Added syntax highlighting and autocompletion for !-style system commands.

Fixes:
- Remove unexpected additional line after output.
- Fix system prompt. Accept !-style inputs again.
- Don't execute PYTHONSTARTUP when -i flag was given.

3.0.10

------------------

Fixes:
- Do dictionary completion on Sequence and Mapping objects (from
collections.abc). Note that dictionary completion is still turned off by
default.

3.0.9

-----------------

New features:
- Allow replacing `PythonInput.completer` at runtime (useful for tools build on
top of ptpython).
- Show REPL title in pager.

3.0.8

-----------------

New features:
- Optional output formatting using Black.
- Optional pager for displaying outputs that don't fit on the screen.
- Added --light-bg and --dark-bg flags to automatically optimize the brightness
of the colors according to the terminal background.
- Addd `PTPYTHON_CONFIG_HOME` for explicitely setting the config directory.
- Show completion suffixes (like '(' for functions).

Fixes:
- Fix dictionary completion on Pandas objects.
- Stop using deprecated Jedi functions.

Links

• PyPI: https://pypi.org/project/prompt-toolkit
• Changelog: https://pyup.io/changelogs/prompt-toolkit/
• Repo: https://github.com/prompt-toolkit/python-prompt-toolkit