vue-masonry: Error when building using Webpack

Hi @shershen08

Thanks for the amazing tool here, and everything works as it should. However, when I tried to bundle everything in Webpack (I used Vue-cli), the below error showed up.

ERROR in static/js/vendor.6534844124b38bd29711.js from UglifyJs
Unexpected token: operator (>) [./node_modules/vue-masonry/src/masonry.plugin.js:19,0][static/js/vendor.6534844124b38bd29711.js:41470,27]

I looked more in details into the above directory, it looks like the following line is causing the problem, but I can’t seem to find out why. Maybe you can discover something I missed here. Thanks.

const stringToBool = val => (val + '').toLowerCase() === 'true'