corrected read in java 8

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromPDFA.java

@@ -62,7 +62,6 @@ public class ZUGFeRDExporterFromPDFA implements IZUGFeRDExporter {
 
 	private byte[] fileToByteArrayInputStream(String pdfFilename) throws IOException {
 		FileInputStream fileInputStream = new FileInputStream(pdfFilename);
-		fileInputStream.reset();
 		byte[] bytes = new byte[fileInputStream.available()];
 		DataInputStream dataInputStream = new DataInputStream(fileInputStream);
 		dataInputStream.readFully(bytes);