bump readme

Author: joemaller

README.md

@@ -23,7 +23,7 @@ To update an existing project or start a new one, run the following commands in
 ##### macOS, Linux & Windows PowerShell
 
 ```
-docker run --rm -it -v ${PWD}:/usr/src/site ideasonpurpose/wordpress:1.4.0 init
+docker run --rm -it -v ${PWD}:/usr/src/site ideasonpurpose/wordpress:6.4.2 init
 ```
 
 Followed by:
@@ -37,7 +37,7 @@ _NOTE: If **~/.composer** doesn't exist, mounting the Docker volume will create
 ##### Windows Command Prompt
 
 ```
-docker run --rm -it -v %cd%:/usr/src/site ideasonpurpose/wordpress:1.4.0 init
+docker run --rm -it -v %cd%:/usr/src/site ideasonpurpose/wordpress:6.4.2 init
 ```
 
 - `init` command copies all the necessary tooling files into place and sets up the default theme directory structure.