2018-05-11: Version 0.2.3

Bugfix #62 and #106: With systemd setups, make /run/stubby directory
writeable for stubby user and include a "appdata_dir" directory
in stubby.yml.example.
Thanks Paul Wouters, eccgecko and Han Vinke
Update securedns.eu entries in stubby.yml.example
Added Cloudflare servers in stubby.yml.example
Added basic upstart script in contrib/upstart dir. Thanks vapniks
Bugfix #98: EDNS options that are handled internally should not
be passed on through downstream. Thanks Twisteroid Ambassador

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