add lisence info

.SRCINFO

@@ -4,7 +4,7 @@ pkgbase = mpdrandom-git
 	pkgrel = 1
 	url = https://github.com/axujen/mpdrandom
 	arch = any
-	license = unknown
+	license = GPL3
 	makedepends = git
 	depends = python
 	depends = python-mpd2

PKGBUILD

@@ -9,7 +9,7 @@ pkgrel=1
 pkgdesc="mpd albums randomizing script"
 arch=('any')
 url="https://github.com/$_gitauthor/$_gitname"
-license=('unknown')
+license=('GPL3')
 depends=('python' 'python-mpd2')
 makedepends=('git')
 provides=('mpdrandom')