Update README / instructions

Author: E-VANCE

README.md

@@ -12,7 +12,7 @@ Add the role to the `galaxy.yml` file of Trellis:
 - name: trellis-matomo
   src: https://github.com/E-VANCE/trellis-matomo
   type: git
-  version: '0.2'
+  version: '0.3'
 ```
 
 Run `ansible-galaxy install -r galaxy.yml` (or `trellis install galaxy` is you have [trellis-cli](https://github.com/roots/trellis-cli)) to install the new role.