chore(devDependencies): update rollup@^0.51.6 from template

Author: arlac77

package.json

@@ -36,7 +36,7 @@
     "underscore": "1.8.3",
     "jsdoc-to-markdown": "^3.0.2",
     "markdown-doctest": "^0.9.1",
-    "rollup": "^0.51.5",
+    "rollup": "^0.51.6",
     "nyc": "^11.3.0"
   },
   "contributors": [