Update README.md

Author: malczuuu

README.md

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 [![Sonatype](https://img.shields.io/maven-central/v/io.github.malczuuu.problem4j/problem4j-core)](https://central.sonatype.com/artifact/io.github.malczuuu.problem4j/problem4j-core)
 [![License](https://img.shields.io/github/license/malczuuu/problem4j-core)](https://github.com/malczuuu/problem4j-core/blob/main/LICENSE)
 
-> Part of [`problem4j`][problem4j] package of libraries.
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 This library provides a minimal, framework-agnostic Java model of the [RFC 7807][rfc7807] "Problem Details" object, with
 an immutable `Problem` class and a fluent `ProblemBuilder` for convenient construction.