docs: Update README.md (#346)

TaroSunn · ktsn · commit fa148fe3d29c · 2019-06-24T22:00:17.000+08:00
Fix spelling mistake
diff --git a/README.md b/README.md
@@ -74,7 +74,7 @@ export default class App extends Vue {
 </script>
 ```
 
-You may also want to check out the `@prop` and `@watch` decorators provided by [vue-property-decorators](https://github.com/kaorun343/vue-property-decorator).
+You may also want to check out the `@prop` and `@watch` decorators provided by [vue-property-decorator](https://github.com/kaorun343/vue-property-decorator).
 
 ### Using Mixins
 
