Release with .unitypackage

[jcs090218]

A little suggestion is to release with the .unitypackage file. It would benefit people who don't use UPM.

[TylerTemp]

As this project has not been updated for a long time, here is one for ppl who need it. (github does not support .unitypackage so it's inside a zip)

NaughtyAttributes_2.1.4.unitypackage.zip

Also, you can check openUPM where there is a "Manual Installation" that you can install this project without using openupm command, with just a text editor