Maven Central POM has wrong license

[petedoyle]

Hello, just a heads up that Maven Central has the wrong licensing info for 4.2.2: https://repo1.maven.org/maven2/com/jjoe64/graphview/4.2.2/graphview-4.2.2.pom

<licenses>
    <license>
        <name>
            GNU GENERAL PUBLIC LICENSE including GPL linking exception
        </name>
        <url>
        https://github.com/jjoe64/GraphView/blob/master/license.txtl
        </url>
        <distribution>repo</distribution>
    </license>
</licenses>

The url also has extension "txtl" instead of "txt".

Was about to make a PR, but looks like the code is ok? https://github.com/jjoe64/GraphView/blob/master/gradle.properties