Bump handlebars from 1.3.0 to 4.3.0

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 1.3.0 to 4.3.0.
- [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@v1.3.0...v4.3.0)

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

Author: dependabot[bot]

package.json

@@ -7,7 +7,7 @@
   "repository": "https://github.com/drewnoakes/fix-decoder.git",
   "author": "Drew Noakes <git@drewnoakes.com> (https://drewnoakes.com)",
   "dependencies": {
-    "handlebars": "1.3.0",
+    "handlebars": "4.3.0",
     "jquery": "2.1.0",
     "lodash": "4.17.13",
     "requirejs": "2.1.11"