fix(package): update addons-linter to version 0.15.15

https://greenkeeper.io/
2017-01-13 16:55:50 +00:00 · 2017-01-13 16:55:50 +00:00 · 5084ccfa4e
--- a/package.json
+++ b/package.json
@ -7,7 +7,7 @@
    "npm": ">= 1.1.x"
  },
  "dependencies": {
-    "addons-linter": "0.15.14",
+    "addons-linter": "0.15.15",
    "clean-css": "3.4.23",
    "less": "2.7.1",
    "stylus": "0.54.5",