Add "file_sha256" to the example file

Author: jmini

src/test/resources/org/gitlab4j/api/package-files.json

@@ -6,7 +6,8 @@
     "file_name": "my-app-1.5-20181107.152550-1.jar",
     "size": 2421,
     "file_md5": "58e6a45a629910c6ff99145a688971ac",
-    "file_sha1": "ebd193463d3915d7e22219f52740056dfd26cbfe"
+    "file_sha1": "ebd193463d3915d7e22219f52740056dfd26cbfe",
+    "file_sha256": "e677d33156215f1afa15c934a4ebd1162c62d0ae0e70d2510b6bc75e651c27b8"
   },
   {
     "id": 26,
@@ -15,7 +16,8 @@
     "file_name": "my-app-1.5-20181107.152550-1.pom",
     "size": 1122,
     "file_md5": "d90f11d851e17c5513586b4a7e98f1b2",
-    "file_sha1": "9608d068fe88aff85781811a42f32d97feb440b5"
+    "file_sha1": "9608d068fe88aff85781811a42f32d97feb440b5",
+    "file_sha256": "621dc7c0a151ab80895237868421eb5708c5285bf88b5ceeac3d77d5be11512b"
   },
   {
     "id": 27,
@@ -24,6 +26,7 @@
     "file_name": "maven-metadata.xml",
     "size": 767,
     "file_md5": "6dfd0cce1203145a927fef5e3a1c650c",
-    "file_sha1": "d25932de56052d320a8ac156f745ece73f6a8cd2"
+    "file_sha1": "d25932de56052d320a8ac156f745ece73f6a8cd2",
+    "file_sha256": "c3e051898b0fb347553424d7947127905b4649961463f8627003f5ce7a6f750c"
   }
 ]