Update README.md

It's better to not modify that directly but use the module system. It does essentially the same, but checks some corner cases where paths are there already, etc.

README.md

@@ -6,7 +6,7 @@ Build and distribute software tools with Spack for the EBRAINS Collaboratory Lab
 - Open a terminal at a running Collaboratory Lab Container and execute the following:
 ```
 #update modulepath of JupterLab container to include spack arch modulefiles path
-export MODULEPATH=$MODULEPATH:/srv/test-build/spack/share/spack/modules/linux-centos7-broadwell/
+module use /srv/test-build/spack/share/spack/modules/linux-centos7-broadwell/
 
 #start JupyterLab kernel made for spack
 jupyter kernelspec install --user /srv/test-build/ebrains-spack-builds/spack_python_kernel_release_20210930/