Update package.json

Author: meet-bhagdev

samples/features/json/angularjs/dotnet-tour-of-heroes/package.json

@@ -25,7 +25,7 @@
     "@angular/platform-browser-dynamic": "~2.1.0",
     "@angular/router": "~3.1.0",
     "@angular/upgrade": "~2.1.0",
-    "bootstrap": "^3.3.7",
+    "bootstrap": "^4.1.2",
     "core-js": "^2.4.1",
     "reflect-metadata": "^0.1.8",
     "rxjs": "5.0.0-beta.12",