Update README.md

Author: malczuuu

README.md

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 # Problem4J Core
 
 [![JitPack](https://jitpack.io/v/malczuuu/problem4j-core.svg)](https://jitpack.io/#malczuuu/problem4j-core)
-[![Build Status](https://github.com/malczuuu/problem4j-jackson/actions/workflows/gradle.yml/badge.svg)](https://github.com/malczuuu/problem4j-jackson/actions/workflows/gradle.yml)
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+[![Build Status](https://github.com/malczuuu/problem4j-core/actions/workflows/gradle.yml/badge.svg)](https://github.com/malczuuu/problem4j-core/actions/workflows/gradle.yml)
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-> Part of [`problem4j`][problem4j] package of libraries.
+> Part of [`problem4j`][problem4j] package of librarieąs.
 
 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.