Updated README

Author: michaelgale

README.md

@@ -604,7 +604,7 @@ b1.save_step_file()
 - v.0.5.1 - Increased the resolution of the gridfinity extruded base profile
 - v.0.5.2 - Adjusted geometry of box/bin floor/lip heights to exactly 7.00 mm intervals
 - v.0.5.3 - Removed a potential namespace collision for computing the height of boxes
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 # References
 
 - [Zach Freedman's YouTube Channel](https://www.youtube.com/c/ZackFreedman)