GUI2 Added selection of background maps

Change-Id: I88ee69fe2ff24bb1b4b3fe633b04f2f1778f3a82
diff --git a/web/gui2-fw-lib/package.json b/web/gui2-fw-lib/package.json
index d12a596..47fc254 100644
--- a/web/gui2-fw-lib/package.json
+++ b/web/gui2-fw-lib/package.json
@@ -24,6 +24,7 @@
     "core-js": "^2.5.4",
     "d3": "^5.2.0",
     "rxjs": "^6.3.3",
+    "topojson-client": "^3.0.0",
     "zone.js": "^0.8.26"
   },
   "devDependencies": {