chore: update bower's D3 dependency (c3js#2331)

kt3k · web-flow · commit 022d0f40f07d · 2018-03-31T16:30:56.000+09:00
Fixes c3js#2327
diff --git a/bower.json b/bower.json
@@ -26,6 +26,6 @@
     "Gruntfile.*"
   ],
   "dependencies": {
-    "d3": "~3.5.0"
+    "d3": "^4.12.0"
   }
 }
