Fix spelling mistakes in README

Author: mattrayner

README.md

@@ -53,7 +53,7 @@ Designed to be a single interface that just 'gets out of your way', and works on
 ## Image Versions
 There are 4 main 'versions' of the docker image. The table below shows the different tags you can use, along with the PHP, MySQL and Apache versions that come with it.
 
-Component | `latest-14.04-php5` | `latest-16.04-php5` | `latest-14.04-php7` | `latest-16.04-php7`
+Component | `latest-1404-php5` | `latest-1604-php5` | `latest-1404-php7` | `latest-1604-php7`
 ---|---|---|---|---
 [Apache][apache] | `2.4.7` | `2.4.18` | `2.4.7` | `2.4.18`
 [MySQL][mysql] | `5.5.61` | `5.7.23` | `5.5.61` | `5.7.23`