add gcodeplot to G-code section

thanks @qckbrnfx for the suggestion!

README.md

@@ -87,13 +87,14 @@ G-code is a text-based standard for controlling CNC machines. Though it was desi
 
 - [grbl](https://github.com/grbl/grbl) - A high-performance G-code interpreting firmware for the Atmega 328 microcontroller and Arduino.
 - [cncjs](https://github.com/cncjs/cncjs) - A web-based interface controlling CNC machines running grbl, TinyG, or other G-code-based firmware.
-- [node-gcode](https://github.com/ryansturmer/node-gcode) - Node.js-based G-code interpreter and simulator.
-- [svg2gcode](https://github.com/em/svg2gcode) - Node.js-based command line utility for converting SVG to G-code.
-- [svg2gcode](https://github.com/vishpat/svg2gcode) - Python-based utility for fast SVG to G-code conversion.
-- [jscut](http://jscut.org/) - A web-based utiltity for converting SVG to G-code.
+- [node-gcode](https://github.com/ryansturmer/node-gcode) - Node.js G-code interpreter and simulator.
+- [svg2gcode](https://github.com/em/svg2gcode) - Node.js command line utility for converting SVG to G-code.
+- [svg2gcode](https://github.com/vishpat/svg2gcode) - Python utility for fast SVG to G-code conversion.
+- [jscut](http://jscut.org/) - A web-based utility for converting SVG to G-code.
 - [Universal-G-Code-Sender](https://github.com/winder/Universal-G-Code-Sender) - Java-based grbl-compatible cross-platform G-code sender.
 - [ChiliPeppr Hardware Fiddle](http://chilipeppr.com) - Modular web-based workspaces to visualize G-code and control hardware.
 - [gcode-generative-for-processing](https://github.com/o0morgan0o/gcode-generative-for-processing) - Processing library, aiming to create gcode from simple shapes. (Designed for usage with the Creality CR10)
+- [gcodeplot](https://github.com/arpruss/gcodeplot) - Python utility to convert SVG and HPGL to G-code for a 3-axis CNC machine.
 
 ### Plotter-Specific