Fixed incorrect casing on license declaration

Jason Gilmore · Jason Gilmore · commit ab5a76dff81a · 2019-07-18T15:52:52.000-04:00
diff --git a/composer.json b/composer.json
@@ -13,7 +13,7 @@
     "nodejs"
   ],
   "license":     [
-    "Proprietary"
+    "proprietary"
   ],
   "authors":     [
     {
