Use markdown for UPGRADE

UPGRADE.md

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+# Introduction
+This document covers basic upgrade notes for major ENiGMA½.
+
+
+# Before Upgrading
+* Always back ALL files in the 'db' directory
+* Back up your menu.hjson (or renamed equivalent)
+
+
+# General Notes
+Upgrades often come with changes to the default `menu.hjson`. It is wise to 
+use a *different* file name for your BBS's version of this file and point to
+it via `config.hjson`. For example:
+
+```hjson
+general: {
+	menuFile: my_bbs.hjson
+}
+```
+
+After updating code, use a program such as DiffMerge to merge in updates to
+`my_bbs.hjson` from the shipping `menu.hjson`.
+
+
+# Pulling Latest From GitHub
+Upgrading from GitHub is easy:
+
+```bash
+cd /path/to/enigma-bbs
+git pull
+npm install
+```
+
+
+# Problems
+Report your issue on Xibalba BBS, hop in #enigma-bbs on Freenet and chat, or
+[file a issue on GitHub](https://github.com/NuSkooler/enigma-bbs/issues).
+
+
+# 0.0.1-alpha to 0.0.4-alpha
+## Node.js 6.x+ LTS is now **required**
+You will need to upgrade Node.js to 6.x+. If using nvm (you should be!) the process will go something like this:
+```bash
+nvm install 6
+nvm alias default 6
+```
+
+## Manual Database Upgrade
+A few upgrades need to be made to your SQLite databases:
+
+```bash
+rm db/file.sqltie3 # safe to delete this time as it was not used previously
+sqlite3 db/message.sqlite
+sqlite> INSERT INTO message_fts(message_fts) VALUES('rebuild');
+```
+
+## Archiver Changes
+If you have overridden or made additions to archivers in your `config.hjson` you will need to update them. See [docs/archive.md](Archive Configuration) and `core/config.js`