Styling improved for horizontal completion menu in ptpython.
Styling improved for horizontal completion menu in ptpython.

jaseg/python-prompt-toolkit,niklasf/python-prompt-toolkit,ddalex/python-prompt-toolkit,Carreau/python-prompt-toolkit,ALSchwalm/python-prompt-toolkit,melund/python-prompt-toolkit,amjith/python-prompt-toolkit,jonathanslenders/python-prompt-toolkit,Carreau/python-prompt-toolkit