Snakefile and units.tsv changed

ATAC-seq_pipeline/units.tsv

 sample	fq1	fq2
 WT1	../data/sample_4_1_R1.fastq.gz	../data/sample_4_1_R2.fastq.gz
-WT2 ../data/sample_8_R1.fastq.gz  ../data/sample_8_R2.fastq.gz
+WT2	../data/sample_8_R1.fastq.gz	../data/sample_8_R2.fastq.gz
 KO1	../data/sample_4_3_R1.fastq.gz	../data/sample_4_3_R2.fastq.gz
-KO2 ../data/sample_12_R1.fastq.gz ../data/sample_12_R2.fastq.gz
+KO2	../data/sample_12_R1.fastq.gz	../data/sample_12_R2.fastq.gz