Minor syntax change
Minor syntax change

Instead of including all the pipeline code, it is possible to print the help when `params.help` is set and terminate the execution with the `return` keywork. In alternative it's also possible to return a non-zero exit status using `exit <code>` function.
metagenomics/bioPipeline,metagenomics/MeRaGENE,metagenomics/bioPipeline,metagenomics/MeRaGENE,metagenomics/MeRaGENE,metagenomics/MeRaGENE,metagenomics/bioPipeline,metagenomics/bioPipeline