fix(package): update ejs to version 3.0.2

Closes #77

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "coffeescript": "^2.3.1",
     "cors": "^2.8.4",
     "debug": "^3.1.0",
-    "ejs": "^2.5.6",
+    "ejs": "^3.0.2",
     "express": "^4.15.3",
     "influx": "^5.0.7",
     "mqtt": "^2.3.0",