修复eslint错误

Author: hyy1115

src/AsyncComponent.js

@@ -2,7 +2,7 @@ import React from 'react'
 const asyncComponent = loadComponent => (
     class AsyncComponent extends React.Component {
         state = {
-            Component: null,
+            Component: null
         }
 
         componentWillMount() {
@@ -16,7 +16,7 @@ const asyncComponent = loadComponent => (
                     this.setState({ Component });
                 })
                 .catch((err) => {
-                    console.error(`Cannot load component in <AsyncComponent />`);
+                    console.error('Cannot load component in <AsyncComponent />')
                     throw err;
                 });
         }