Fix npm licence warning

oliversalzburg · oliversalzburg · commit 26ece5677761 · 2015-08-10T20:59:08.000+02:00
diff --git a/package.json b/package.json
@@ -6,6 +6,7 @@
         "Victor Homyakov <vkhomyackov@gmail.com> (https://github.com/victor-homyakov)"
     ],
     "version": "0.6.4",
+    "license": "SEE LICENSE IN LICENSE",
     "keywords": [
         "stacktrace",
         "error",
