Update package.json (Baeldung#41)

Added line resolves the bellow issue occurs when building the project.
ERROR in /home/bati/spring/spring-security-oauth/spring-security-oauth-ui-implicit-angular4/src/main/resources/src/app/app.service.ts (3,24): Cannot find module 'ng2-cookies'.

Author: vithubati

spring-security-oauth-ui-implicit-angular4/src/main/resources/package.json

@@ -24,6 +24,7 @@
     "rxjs": "^5.1.0",
     "zone.js": "^0.8.4",
     "angular-oauth2-oidc":">=1.0.20"
+    "ng2-cookies": ">=1.0.12"
   },
   "devDependencies": {
     "@angular/cli": "1.0.1",