BLD: Add python-xlib dependency which was missing.

hhslepicka · hhslepicka · commit 81fa1ff4c37d · 2021-06-16T22:00:59.000-07:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,5 @@
 pyautogui
 pyperclip
 opencv-python
-keyboard
+keyboard
+python-xlib
