fix python interpreter

alacritty_config_gui.py

@@ -10,7 +10,7 @@ try:
 except:
     print('alacritty-config-gui depends on PyQt5. I couldn’t locate PyQt5.')
     print('Sorry about that.')
-    print('\nRunning `pip3 install PyQt5` could help.')
+    print('\nRunning `pip install PyQt5` could help.')
     sys.exit(1)