Fix wo update & cleanup info

* update README.md
* cleanup changelog.md
* fix wo update command url
* remove php-sodium (php7.0 & php7.1 only)
* remove php-memcache

CHANGELOG.md

@@ -1,13 +1,36 @@
-### v3.9.0 - November 30, 2018
+# Changelog
 
-**Initial release**
+All notable changes to this project will be documented in this file.
 
-[+] Rebranded the fork to WordOps
-[+] Codebase cleanup
-[+] Set PHP 7.2 as the default
-[+] Included support for newer OS releases
-[+] Reworked the HTTPS configuration
-[+] Added more automated testing with Redis
-[=] Replaced Postfix with smtp-cli
-[-] Dropped mail services
-[-] Dropped w3tc support
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+
+### v3.X.X - [Unreleased]
+
+#### Changed
+
+- Updating nginx fastcgi_cache template
+- Updating Nginx configuration for WordPress 5.0
+- remove --experimental args
+
+#### Added
+
+- Add webp image support with nginx mapping
+- Add PHP 7.3 support
+
+#### Fixed
+
+- Nginx variable $webp_suffix on fresh install
+
+### v3.9.2 - November 30, 2018
+
+#### Changed
+
+- Rebranded the fork to WordOps
+- Codebase cleanup
+- Set PHP 7.2 as the default
+- Included support for newer OS releases
+- Reworked the HTTPS configuration
+- Added more automated testing with Redis
+- Replaced Postfix with smtp-cli
+- Dropped mail services
+- Dropped w3tc support