Willson Mock

Here are my dependencies from `package.json`: ``` "devDependencies": { "@babel/cli": "7.2.3", "@babel/core": "7.3.3", "@babel/plugin-proposal-class-properties": "7.3.3", "@babel/plugin-proposal-decorators": "7.3.0", "@babel/plugin-proposal-object-rest-spread": "7.3.2", "@babel/preset-env": "7.3.1", "@babel/preset-react": "7.0.0", "@babel/register": "7.0.0", "app-module-path": "2.2.0", "autoprefixer": "9.4.8", "babel-eslint":...

Fixed multiple grammatical and spelling issues found in the README.md file. No other changes were made and no other files were changed.

It seems like the `SerializableError` class isn't being auto-generated correctly and maybe its related to this: ``` java public final Class