Update matchdep requirement from ^0.3.0 to ^2.0.0 (#118)

Updates the requirements on [matchdep](https://github.com/tkellen/js-matchdep) to permit the latest version.
- [Release notes](https://github.com/tkellen/js-matchdep/releases)
- [Commits](https://github.com/tkellen/js-matchdep/commits/v2.0.0)

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

package.json

@@ -44,7 +44,7 @@
     "karma-phantomjs-launcher": "^1.0.4",
     "leaflet": "^1.0.0",
     "leaflet-toolbar": "^0.3.0",
-    "matchdep": "^0.3.0",
+    "matchdep": "^2.0.0",
     "mocha": "^5.2.0",
     "sinon": "^7.2.2"
   },