Close#1285
Squashed commit of the following:
commit fdc616f38651f9fcc16442003bd15adb88e2c2b1
Author: Simon Zolin <s.zolin@adguard.com>
Date: Wed Jan 15 18:46:00 2020 +0300
minor
commit 6f5a22c86e5fe76c3959343a8077d3997ff0707d
Author: Simon Zolin <s.zolin@adguard.com>
Date: Mon Dec 30 19:19:30 2019 +0300
+ --version: Show the version and exit