Support for JUnit 5

[florianluediger]

Are you planning on officially supporting JUnit 5 in the future?

I could not find any information about that on GitHub or your website and switching to JUnit 5 in a test class using your library leads to errors.

[oucem]

You can execute JUnit 4 with JUnit 5 using JUnit 5 Vintage, JUnit Vintage is a module that allows backward compatibility with JUnit 4

`

org.junit.vintage

<artifactId>junit-vintage-engine</artifactId>
<version>${junit5.vintage.version}</version>
<scope>test</scope>

`