docs: Update README.md (#470)

andreas83 · apertureless · commit c5709128e254 · 2019-02-18T09:26:02.000+01:00
small typo / syntax error in one example
### Fix 
- [ x] All tests passed
diff --git a/docs/guide/README.md b/docs/guide/README.md
@@ -344,7 +344,7 @@ export default {
     chartdata: {
       type: Object,
       default: null
-    }
+    },
     options: {
       type: Object,
       default: null
