Documentation Updates

Thanks to the help from @pid1 for this release. The documentation mistakenly noted to use pre-down for the script now (compared to down originally, which failed as the tun or tap device would have been removed before the script ran). However, this should have in fact been down-pre.

Code Refactoring & Additional Tests

Thanks to the work by @BaxterStockman, the script has been refactored, hopefully making it easier to read and follow, while additional tests around IPv6 processing have been added.

Initial Release

First release of update-systemd-resolved. Should fully support the three standard DHCP options in OpenVPN (DNS, DOMAIN, and DOMAIN-SEARCH) with integration tests around the code to manage and monitor regressions. Also supports multiple (and combined) IPv4 and IPv6 DNS addresses.