Distribution file compatibility

This issue came up because of IE11, but I totally understand if including support for IE11 is not something within the scope of this library. It looks like es2015 compatibility is desired based on the .babelrc:

https://github.com/akxcv/vuera/blob/30ab626d8105ed8b2223ca2aa45495daa112529a/.babelrc#L6

However, both Object.assign and Object.entries appear in the built common js file:

https://github.com/akxcv/vuera/blob/30ab626d8105ed8b2223ca2aa45495daa112529a/dist/vuera.cjs.js#L229

https://github.com/akxcv/vuera/blob/30ab626d8105ed8b2223ca2aa45495daa112529a/dist/vuera.cjs.js#L451

I always forget which level Object.assigns is at, but I believe Object.entries is much more recent? Is this maybe a bug in the rollup or babel configuration during the build?

Thanks!