Update dependencies for security fixes

Currently the package is dependent on `NETStandard.Library@1.6.1` which by it's own dependencies generates security warnings (6 in total). Updating it to the current latest version v2.0.3 solves the security issues. A quick scan with Snyk can show this.

Can we get an update to resolve these issues?

Start by locating the project file that declares NETStandard.Library@1.6.1 and inspect how its dependencies are restored. Confirm the six security warnings with a Snyk scan, update the dependency to v2.0.3, and rerun the scan to verify that the reported issues are resolved.

Written by the indexing model from the issue text.