Bump handlebars from 4.0.11 to 4.1.2 (DanWahlin#14)

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.0.11 to 4.1.2.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.0.11...v4.1.2)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -25,7 +25,7 @@
     "express": "^4.16.2",
     "express-convention-routes": "^1.0.5",
     "express-handlebars": "^3.0.0",
-    "handlebars": "^4.0.11",
+    "handlebars": "^4.1.2",
     "handlebars-helpers": "^0.10.0",
     "handlebars-layouts": "^3.1.4",
     "merge": "^1.2.0",