update to latest version of gcode2contour

requirements.txt

@@ -4,7 +4,7 @@ certifi==2020.11.8
 cycler==0.10.0
 Cython==0.29.21
 decorator==4.4.2
-gcode2contour @ git+https://code.research.uts.edu.au/bigprint/gcode2contour.git@e2992238f1bff0c1eae143773e6eab32fb3f7a10
+gcode2contour @ git+https://code.research.uts.edu.au/bigprint/gcode2contour.git@01eb49aee19574572fafdb7d8134c3638783fc75
 ipython==7.19.0
 ipython-genutils==0.2.0
 jedi==0.17.2