Doesn't update class properties

### Description

If I update value in class properties the page is redrawn only after the first change, then the value does not change.

### Start

In render:

`{this.test()}`

test function:

`test = () => {
debugger;
return '1'
};`

### Steps

1. Open page

file:

> _defineProperty(_assertThisInitialized(_this), "test", function () {
> debugger;
> return '1';
> });

2. Change return value to '2'

file:

> _defineProperty(_assertThisInitialized(_this), "test", function () {
> debugger;
> return '2';
> });

loader:

> ( function REACT_HOT_LOADER_SANDBOX () {
> var _this = this; // common babel transpile
>
>
> return function () {
> debugger;
> return '2';
> };
> }).call(this)

3. Change return value to '3'

file:

> _defineProperty(_assertThisInitialized(_this), "test", function () {
> debugger;
> return '3';
> });

loader:

> (function REACT_HOT_LOADER_SANDBOX () {
> var _this = this; // common babel transpile
>
>
> return function () {
> debugger;
> return '2';
> };
> }).call(this)

if I use `test () { ... };`
there is not problem

### .babelrc

> {
"plugins": [
"@babel/plugin-proposal-class-properties",
"@babel/plugin-proposal-object-rest-spread",
"@babel/plugin-transform-arrow-functions",
"@babel/plugin-transform-destructuring"
],
"presets": [
"@babel/preset-env",
"@babel/preset-react"
]
}

### Webpack

> {
test: /\.js?$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
options: {
cacheDirectory: true,
plugins: !isProduction ? [
"react-hot-loader/babel"
] : [
"@babel/plugin-transform-runtime",
]
}
}
}

### Root

> import 'core/polyfills';
>
> import { hot } from 'react-hot-loader/root';
>
> import React from 'react';
> import ReactDOM from 'react-dom';
> import Root from './Root';
>
> import './css/main.styl';
>
> const App = hot(Root);
>
> ReactDOM.render(
> ,
> document.getElementsByClassName('b-app-wrapper')[0]

### Environment

React Hot Loader version:

Run these commands in the project folder and fill in their results:

1. `node -v`: v8.9.1
2. `npm -v`: 5.5.1
3. "webpack": "^4.28.4"
4. "react": "^16.9.0"
5. "react-hot-loader": "^4.12.11"

Then, specify:

1. Operating system: Windows 7
2. Browser and version: Chrome