[JIRA] : update issues epic link example (#635)

* JIRA : update issues epic link example

* black formatting changes to let black command succeed in CI tests

Author: isaac-philip

examples/jira/jira_issue_update_epic_link.py

@@ -0,0 +1,23 @@
+"""
+    Update the Epic Link for issue(s)
+"""
+
+
+from atlassian.jira import Jira
+
+# the Issues which we want to place to a certain EPIC
+update_issues = ["ARA-1233", "ARA-1234"]
+
+
+def main():
+    jira = Jira(url="https://jira.example.com/", username="user", password="pass123")
+    epic_link_custom_field_id = "customfield_1404"  # Epic Link Custom Field
+    target_epic_issue_key = "ARA-1314"
+    for issue_key in update_issues:
+        issue_data = jira.update_issue_field(issue_key, fields={epic_link_custom_field_id: target_epic_issue_key})
+        print(f"updated for {issue_key}")
+    print("done")
+
+
+if __name__ == "__main__":
+    main()