Merge branch 'patch-1' into 'master'

removing trailing spaces causing `/bin/bash command not found`

See merge request !4

README.md

@@ -211,7 +211,7 @@ rule mapping:
   output: "bowtie2/H3K4-TC1-ST2-D0.12.bam"
   shell:
     """
-    bowtie2 -x reference/Mus_musculus.GRCm38.dna_sm.chromosome.12 -U {input} | \  
+    bowtie2 -x reference/Mus_musculus.GRCm38.dna_sm.chromosome.12 -U {input} | \
     samtools sort - > {output}
     samtools index {output}
     """