U fix serialization error in gradle

Author: fvarrui

src/main/java/io/github/fvarrui/javapackager/model/CFBundlePackageType.java

@@ -1,6 +1,8 @@
 package io.github.fvarrui.javapackager.model;
 
-public enum CFBundlePackageType {
+import java.io.Serializable;
+
+public enum CFBundlePackageType implements Serializable {
 	BNDL,
 	APPL,
 	FMWK

src/main/java/io/github/fvarrui/javapackager/model/InfoPlist.java

@@ -1,7 +1,10 @@
 package io.github.fvarrui.javapackager.model;
 
-public class InfoPlist {
+import java.io.Serializable;
 
+public class InfoPlist implements Serializable {
+	private static final long serialVersionUID = -1237535573669475709L;
+	
 	private String additionalEntries = "";
 	private CFBundlePackageType bundlePackageType = CFBundlePackageType.BNDL;