Missing `build` folder & qrcode.js file in v1.5.2, v1.5.3, v1.5.4

The latest versions on npm are missing the build folder (which existed up to version 1.5.1 and is missing in 1.5.2, 1.5.3, 1.5.4). The build folder contains the compiled qrcode.js file mentioned in the README https://github.com/soldair/node-qrcode?#precompiled-bundle.

• https://github.com/soldair/node-qrcode/issues/333
• https://github.com/soldair/node-qrcode/issues/335
• https://github.com/soldair/node-qrcode/issues/346
• https://github.com/soldair/node-qrcode/issues/355
• https://github.com/soldair/node-qrcode/issues/362
• https://github.com/soldair/node-qrcode/issues/363

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Compare v1.5.1 & v1.5.4:

• https://www.npmjs.com/package/qrcode/v/1.5.1?activeTab=code
• https://www.npmjs.com/package/qrcode/v/1.5.4?activeTab=code