Update license in composer.json.

JJJ · JJJ · commit 7e4cf0f7adf9 · 2018-01-25T19:09:29.000-06:00
diff --git a/composer.json b/composer.json
@@ -7,7 +7,7 @@
     "php": ">=5.2",
     "composer/installers": "^1.0"
   },
-  "license": "GPLv2 or later",
+  "license": "GPL-2.0-or-later",
   "authors": [
     {
       "name": "John James Jacoby",
