Fix versioning to be accepted into the Rack community repository

[AndrewBelt]

Rack v0.5.1 will include a plugin manager, and plugins need to follow the versioning guidelines in order to be accepted. You can use this example plugin Makefile and Tutorial.cpp file as a reference for making sure the version is the same in the C++, Makefile, and JSON manifest.

• Your plugin is versioned as v1.0. This needs to be v0.5.something.

Once you've fixed this, send a PR to the Rack community repository and remove the "disabled" property in the JSON manifest file.

[naus3a]

did it, thanks