v2.3.1

Changelog

Fixes:-

f6fc4e5 Fixed a bug with severity flag parsing
a302914 Fixed panic crash with http status codes
fffc1d1 Fixed retries in DNS requests failing
266e332 Added exclude-tags/etags support, dos tag will be excluded as default.
d8bb580 Added support to use severity with tags, (-tags low,high)
31094ab Added issue-tracker-config file