**Added:**

* support PTK's clipboard integration if pyperclip is installed.
    So that some common emacs like
    `cut/copy <https://github.com/prompt-toolkit/python-prompt-toolkit/blob/master/examples/prompts/system-clipboard-integration.py>`_
    will work out of the box.


**Changed:**

* <news item>

**Deprecated:**

* <news item>

**Removed:**

* <news item>

**Fixed:**

* <news item>

**Security:**

* <news item>
