Update bower.json

bower.json

@@ -14,7 +14,8 @@
     "jquery": "^3",
     "bootstrap": "https://github.com/twbs/bootstrap.git#v4.0.0-alpha.5",
     "font-awesome": "^4",
-    "tether": "https://github.com/HubSpot/tether.git#v1.3.7"
+    "tether": "https://github.com/HubSpot/tether.git#v1.3.7",
+    "chart.js": "^2.4.0"
   },
   "keywords": [
     "css",