ZUGFeRDImporter encoding problem

[asdf00000]

When the default charset of the JVM is not UTF-8, getUTF8() in ZUGFeRDImporter does return an incorrectly encoded XML string.

How to reproduce the issue:

public static void main(String[] arg) {

	Path p = Paths.get("invoice.pdf");
	try (InputStream input = Files.newInputStream(p)) {
		ZUGFeRDImporter zi = new ZUGFeRDImporter(input);
		String xml = zi.getUTF8();
		System.out.println(xml);
	} catch (IOException e) {
		e.printStackTrace();
	}
}

Run this with -Dfile.encoding=ISO-8859-1. It will return an XML-String that contains for example München instead of München.

To fix it, set the encoding explicitly to UTF-8 in getUTF()

public String getUTF8() {
	...
 	return new String(bomlessData, StandardCharsets.UTF_8);
}

I made a pull request.