2017-12-18: Version 0.2.0

• Add Powershell scripts for Windows 7 that will update the IPv4 DNS resolvers.
• Add Windows scripts to enable a Scheduled task for stubby
• Add files to support a separate macOS GUI application to manage stubby
  https://dnsprivacy.org/wiki/x/CIBn
• Add Quad9 details to the configuration file
• Bugfix #48: Do not do native DNSSEC validation when cd bit was
  received (for example from an unbound forwarder), but DNSSEC
  validation was not enabled in the first place.
• Bugfix getdnsapi/getdns#358: Parse config files given with the
  -C option that have an .yaml extension as YAML not JSON.
  Thanks Ollivier Robert