title: snakemake wrapper: pointing wildcard to a list either config.yaml or txt
body: <p>I am trying to use the following snakemake wrapper:</p>
  <pre><code>rule get_fastq_pe:
      output:
          # the wildcard name must be accession, pointing to an SRA number
          &quot;data/{accession}_1.fastq&quot;,
          &quot;data/{accession}_2.fastq&quot;
      params:
          # optional extra arguments
          extra=&quot;&quot;
      threads: 6  # defaults to 6
      wrapper:
          &quot;0.73.0/bio/sra-tools/fasterq-dump&quot;
  </code></pre>
  <p>How would you direct accession to multiple SRR accessions either in a txt file or config.yaml file?</p>