Bump merge from 1.2.1 to 2.1.1 in /DotNetSyntaxTreeVisualizer/ClientApp (#21)

Bumps [merge](https://github.com/yeikos/js.merge) from 1.2.1 to 2.1.1.
- [Release notes](https://github.com/yeikos/js.merge/releases)
- [Commits](swordev/merge@v1.2.1...v2.1.1)

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DotNetSyntaxTreeVisualizer/ClientApp/package-lock.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "bootstrap": "^4.1.3",
     "jquery": "^3.4.1",
-    "merge": "^1.2.1",
+    "merge": "^2.1.1",
     "oidc-client": "^1.9.0",
     "react": "^16.0.0",
     "react-d3-tree": "^1.16.1",