看到「Django 1.11 released」這篇才發現 django 也有設計 LTS 機制... 在「Django’s release process」這邊有介紹：
Certain feature releases will be designated as long-term support (LTS) releases. These releases will get security and data loss fixes applied for a guaranteed period of time, typically three years.
所以是提供三年的維護期...