chore(package): update ejs to version 3.1.3

Closes #146

Author: greenkeeper[bot]

package.json

@@ -71,7 +71,7 @@
     "babel-core": "^6.17.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-preset-es2015": "^6.16.0",
-    "ejs": "^2.6.2",
+    "ejs": "^3.1.3",
     "js-beautify": "^1.6.4",
     "jshint": "^2.9.3",
     "mocha": "^5.0.0"