Update README.md

zhanziyang · web-flow · commit d9483d938f30 · 2017-09-15T11:23:48.000+08:00
diff --git a/README.md b/README.md
@@ -517,3 +517,6 @@ Edit file `./docs/simple-test.html` and open http://localhost:3000/simple-test.h
 # under vue-croppa/
 $ npm run build
 ```
+
+## To Do
+- [ ] Use `ref` to call methods instead of `v-model`.
