Update README.md

Removed old plugin (it's no longer needed, cura can do it on it's own)

README.md

@@ -45,7 +45,6 @@ Please checkout [cura-build](https://github.com/Ultimaker/cura-build)
 
 Third party plugins
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-* [Print Cost Calculator](https://github.com/nallath/PrintCostCalculator): Calculates weight and monetary cost of your print.
 * [Post Processing Plugin](https://github.com/nallath/PostProcessingPlugin): Allows for post-processing scripts to run on g-code.
 * [Barbarian Plugin](https://github.com/nallath/BarbarianPlugin): Simple scale tool for imperial to metric.
 * [X3G Writer](https://github.com/Ghostkeeper/X3GWriter): Adds support for exporting X3G files.