Add the python 3.6 check to all entry points

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

tuhi.in

@@ -22,6 +22,9 @@ tuhi_gui = Path('@libexecdir@', 'tuhi-gui')
 @devel@  # NOQA
 
 if __name__ == '__main__':
+    if sys.version_info < (3, 6):
+        sys.exit('Python 3.6 or later required')
+
     args = sys.argv[1:]
     tuhi = subprocess.Popen([tuhi_server] + args)
     try:

tuhi/gui/application.py

@@ -147,6 +147,9 @@ def gtk_style():
 
 
 def main(argv):
+    if sys.version_info < (3, 6):
+        sys.exit('Python 3.6 or later required')
+
     import gettext
     import locale
     import signal