fix: examples/tree-view/package.json, examples/tree-view/package-lock…

….json & examples/tree-view/.snyk to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-567746

examples/tree-view/package.json

@@ -12,12 +12,16 @@
     "react": "^15.5.0",
     "react-dom": "^15.5.0",
     "react-redux": "^5.0.5",
-    "redux": "^3.5.2"
+    "redux": "^3.5.2",
+    "snyk": "^1.316.1"
   },
   "scripts": {
     "start": "react-scripts start",
     "build": "react-scripts build",
     "eject": "react-scripts eject",
-    "test": "react-scripts test"
-  }
+    "test": "react-scripts test",
+    "snyk-protect": "snyk protect",
+    "prepare": "npm run snyk-protect"
+  },
+  "snyk": true
 }