Update README.md (#229)fix libGDX unavailable url
Mention another alternative to jpackage/packr in the READMEConveyor is a new packaging tool that supports JVM apps and has a variety of features that jpackage/packr lack. See here for details:https://conveyor.hydraulic.dev/
macOS on M1Tested on:macOS MontereyVersion 12.4Chip Apple M1
vmArgs argument header needs its arguments to lead with `-`, but it claims not to.The documentation claims that arguments header `vmArgs` should not have a leading `-`, but my testing shows that they do need to have a leading `-`.