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babel的loose模式会导致此模块在electron下无法加载

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### Summary 如题，默认构建的 `build/g2-plugin-slider.js:502` 中 `subClass.prototype.constructor = subClass`，为只读属性，语句无法操作成功。 ``` Uncaught TypeError: Cannot assign to read only property 'constructor' of object '#' at _inheritsLoose (webpack:///./node_modules/@antv/g2-plugin-slider/build/g2-plugin-slider.js?:497) at eval (webpack:///./node_modules/@antv/g2-plugin-slider/build/g2-plugin-slider.js?:513) at Object.eval (webpack:///./node_modules/@antv/g2-plugin-slider/build/g2-plugin-slider.js?:909)...