update sqlg version

Author: pietermartin

README.md

@@ -1,7 +1,7 @@
 
 [![Maven Central](http://img.shields.io/maven-central/v/org.umlg/sqlg)](https://search.maven.org/search?q=g:org.umlg%20AND%20a:sqlg)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-[![License: MIT](https://img.shields.io/badge/coverage-88%25-blue?style=flat&labelColor=5b5b5b&color=96c20d)](https://sqlg.org/docs/3.1.0/postgresql/codeCoverage/index.html)
+[![License: MIT](https://img.shields.io/badge/coverage-88%25-blue?style=flat&labelColor=5b5b5b&color=96c20d)](https://sqlg.org/docs/3.1.2/postgresql/codeCoverage/index.html)
 
 Sqlg
 ====