Bump ejs from 0.8.8 to 2.7.1

Bumps [ejs](https://github.com/mde/ejs) from 0.8.8 to 2.7.1.
- [Release notes](https://github.com/mde/ejs/releases)
- [Changelog](https://github.com/mde/ejs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mde/ejs/commits/v2.7.1)
Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -12,7 +12,7 @@
     "errorhandler": "~1.0.0",
     "compression": "~1.0.1",
     "lodash": "~4.17.15",
-    "ejs": "~0.8.4"
+    "ejs": "~2.7.1"
   },
   "devDependencies": {
     "grunt": "~0.4.1",