tweaked config

README.md

@@ -12,4 +12,8 @@ Usage as cli:
 _python convert.py source.svg destination.gcode_
 
 
-there are various settings you can change in config.py
+There are various settings you can change in config.py. Most notably, you must set an upper and lower position for the z axis.
+
+zTravel is the height it will move to before traveling to the next stroke
+
+zDraw should be the height at which the pen will make contact with the paper