fix(package): update c3 to version 0.6.5

Closes #143

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
   "dependencies": {
     "babel-polyfill": "^6.3.14",
     "bootstrap": "^3.3.6",
-    "c3": "^0.4.11",
+    "c3": "^0.6.5",
     "classnames": "^2.2.1",
     "d3": "^4.3.0",
     "dexie": "^1.3.1",