STYLE: Add message error CircleCI does not build changes to Slicer dependencies

This error appears when the slicer/slicer-build-deps docker image is not
updated with the actual version of slicer.

In order to fix the issue, please create a Pull Request like this one
https://github.com/thewtex/SlicerDocker/pull/21

This will build and push all images based on the newer version of Slicer

From: Mayeul Chassagnard <mayeul.chassagnard@kitware.com>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@25724 3bd1e089-480b-0410-8dfb-8563597acbee