Bump xlsx from 0.15.3 to 0.15.4

Bumps [xlsx](https://github.com/SheetJS/js-xlsx) from 0.15.3 to 0.15.4. - [Release notes](https://github.com/SheetJS/js-xlsx/releases) - [Changelog](https://github.com/SheetJS/sheetjs/blob/master/CHANGELOG.md) - [Commits](https://github.com/SheetJS/js-xlsx/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -131,7 +131,7 @@
  "proj4": "2.6.0",
  "promise-polyfill": "8.1.3",
  "three": "0.92.0",
- "xlsx": "0.15.3",
+ "xlsx": "0.15.4",
  "xml-js": "1.6.11"
  },
  "pre-commit": [