chore(devDependencies): update rollup@^0.52.3 from template

docs(package): remove keyword null

Author: arlac77

package.json

@@ -35,7 +35,7 @@
     "jsdoc-to-markdown": "^3.0.2",
     "markdown-doctest": "^0.9.1",
     "nyc": "^11.4.1",
-    "rollup": "^0.52.2",
+    "rollup": "^0.52.3",
     "rollup-plugin-multi-entry": "^2.0.2",
     "semantic-release": "^11.0.2",
     "xo": "^0.19.0"