update license MIT -> GPL

Author: callmecavs

LICENSE

@@ -168,6 +168,6 @@ To add support for older browsers, consider including polyfills/shims for the AP
 
 ## License
 
-MIT. © 2015 Michael Cavalea
+[GPL-3.0](http://www.gnu.org/licenses/gpl.txt). © 2016 Michael Cavalea
 
 [![Built With Love](http://forthebadge.com/images/badges/built-with-love.svg)](http://forthebadge.com)

README.md

@@ -1,12 +1,12 @@
 {
   "name":        "jump.js",
-  "version":     "0.3.1",
+  "version":     "0.3.2",
   "description": "A small, modern, dependency-free smooth scrolling library.",
   "homepage":    "https://github.com/callmecavs/jump.js",
   "main":        "dist/jump.min.js",
 
   "author":  "Michael Cavalea",
-  "license": "MIT",
+  "license": "GPL-3.0",
 
   "repository": {
     "type": "git",