Add release link

Author: ololobus

README.md

@@ -1,5 +1,5 @@
 [![Build Status](https://travis-ci.com/postgrespro/ptrack.svg?branch=master)](https://travis-ci.com/postgrespro/ptrack)
-![GitHub tag (latest SemVer)](https://img.shields.io/github/v/tag/postgrespro/ptrack?label=release)
+[![GitHub release](https://img.shields.io/github/v/release/postgrespro/ptrack?include_prereleases)](https://github.com/postgrespro/ptrack/releases/latest)
 
 # ptrack