added sha256 field in package file

Author: Valentin Manea

src/main/java/org/gitlab4j/api/models/PackageFile.java

@@ -17,6 +17,7 @@ public class PackageFile implements Serializable {
     private Long size;
     private String fileMd5;
     private String fileSha1;
+    private String fileSha256;
 
     public Long getId() {
         return id;
@@ -93,6 +94,14 @@ public void setFileSha1(String fileSha1) {
         this.fileSha1 = fileSha1;
     }
 
+    public String getFileSha256() {
+        return fileSha256;
+    }
+
+    public void setFileSha256(String fileSha256) {
+        this.fileSha256 = fileSha256;
+    }
+
     @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));