minor corrections

README.md

@@ -32,9 +32,10 @@ If you set up a Maven project, you can reference the mustang artifact like this:
 
 ```xml
 <dependency>
-  <groupId>org.mustangproject</groupId>
-  <artifactId>library</artifactId>
- <version>2.14.0</version>
+    <groupId>org.mustangproject</groupId>
+    <artifactId>validator</artifactId>
+    <version>2.15.0</version>
+    <classifier>shaded</classifier>
 </dependency>
 ```
 

library/src/main/java/org/mustangproject/DirectDebit.java

@@ -16,6 +16,13 @@ public class DirectDebit implements IZUGFeRDTradeSettlementDebit {
 	 */
 	protected final String mandate;
 
+	/**
+	 * bean constructor
+	 */
+	public DirectDebit() {
+
+	}
+
 	/***
 	 * constructor for normal use :-)
 	 * @param IBAN the IBAN as string

library/src/main/java/org/mustangproject/FileAttachment.java

@@ -8,6 +8,14 @@ public class FileAttachment {
 	protected String description;
 	protected byte[] data;
 
+
+	/***
+	 * bean contructor
+	 */
+	public FileAttachment() {
+
+	}
+
 	public FileAttachment(String filename, String mimetype, String relation, byte[] data) {
 		this.filename = filename;
 		this.mimetype = mimetype;

library/src/main/java/org/mustangproject/IncludedNote.java

@@ -4,8 +4,8 @@ package org.mustangproject;
  * A grouping of business terms to indicate accounting-relevant free texts including a qualification of these.
  */
 public class IncludedNote {
-  private final String content;
-  private final SubjectCode subjectCode;
+  private String content;
+  private SubjectCode subjectCode;
 
   private static final String INCLUDE_START = "<ram:IncludedNote>";
   private static final String INCLUDE_END = "</ram:IncludedNote>";
@@ -19,6 +19,13 @@ public class IncludedNote {
     this.subjectCode = subjectCode;
   }
 
+	/**
+	 * bean constructor
+	 */
+	public  IncludedNote() {
+
+	}
+
   public static IncludedNote generalNote(String content) {
     return new IncludedNote(content, SubjectCode.AAI);
   }