Encode password before it is saved to file as Python 3 input returns a string, not bytes

buildozer/targets/ios.py

@@ -411,7 +411,7 @@ class TargetIos(Target):
 
         if save:
             with open(password_file, 'wb') as fd:
-                fd.write(password)
+                fd.write(password.encode())
 
 def get_target(buildozer):
     return TargetIos(buildozer)