fix: package.json to reduce vulnerabilities (#11)
fix: package.json to reduce vulnerabilities (#11)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:xlsx:20180222

Latest report for frontiernav/frontiernav-data:
https://snyk.io/test/github/frontiernav/frontiernav-data
frontiernav/frontiernav-data,frontiernav/frontiernav-data