Remove reference to assertj.org.
Fixes
<name>AssertJ - Fluent assertions for java unit testing</name>
<description>Parent POM for all AssertJ modules</description>
- <url>http://assertj.org</url>
+ <url>https://assertj.github.io/doc/</url>
<organization>
<name>AssertJ</name>
<url>https://assertj.github.io/doc/</url>
