[dist] Update dependency auto-changelog to v2

Author: renovate-bot

package-lock.json

@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "async": "^3.0.0",
-    "auto-changelog": "^1.15.0",
+    "auto-changelog": "^2.0.0",
     "concat-stream": "^2.0.0",
     "expect.js": "~0.3.1",
     "mocha": "^3.5.3",