message: fix entry js
diff: export * from './lib/zrender';
  export * from './lib/export';
  -import {registerPainter} from './src/zrender';
  -import CanvasPainter from './src/canvas/Painter';
  -import SVGPainter from './src/svg/Painter';
  +import {registerPainter} from './lib/zrender';
  +import CanvasPainter from './lib/canvas/Painter';
  +import SVGPainter from './lib/svg/Painter';
  registerPainter('canvas', CanvasPainter);
  registerPainter('svg', SVGPainter);
  