fix: patch for existing issues

erpnext/patches.txt

@@ -781,3 +781,4 @@ erpnext.patches.v13_0.germany_fill_debtor_creditor_number
 erpnext.patches.v13_0.set_pos_closing_as_failed
 erpnext.patches.v13_0.update_timesheet_changes
 erpnext.patches.v13_0.set_training_event_attendance
+erpnext.patches.v13_0.rename_issue_status_hold_to_on_hold

erpnext/patches/v13_0/rename_issue_status_hold_to_on_hold.py

@@ -0,0 +1,20 @@
+# Copyright (c) 2020, Frappe and Contributors
+# License: GNU General Public License v3. See license.txt
+
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	if frappe.db.exists('DocType', 'Issue'):
+        frappe.reload_doc("support", "doctype", "issue")
+	    rename_status()
+
+def rename_status():
+	frappe.db.sql("""
+		UPDATE
+            `tabIssue`
+		SET
+            status = 'On Hold'
+        WHERE
+            status = 'Hold'
+	""")