build: avoid warning if library is < 750KB

If we go beyond this limit, we'll have to put it on a diet.

webpack.config.js

         filename: `[name]${minimize ? '.min' : ''}.js`,
         path: process.cwd(),
         sourceMapFilename: `[name].${minimize ? 'min' : 'js'}.map`
+    },
+    performance: {
+        maxAssetSize: 750000,
+        maxEntrypointSize: 750000
     }
 };