kitty: Update to 0.15.1

0.15.1 [2019-12-21]

    Fix a crash/incorrect rendering when detaching a window in some circumstances

    hints kitten: Add an option kitty +kitten hints --ascending to control if the hints numbers increase or decrease from top to bottom

    Fix background_opacity incorrectly applying to selected text and reverse video text

    Add a new option tab_bar_background to specify a different color for the tab bar

    Add a new option active_tab_title_template to specify a different template for active tab titles

    Fix lines at the edge of the window at certain windows sizes when drawing images on a transparent window

    Fix window not being rendered for the first time until some input has been received from child process

(nia)