update count

tasks/count.wdl

@@ -8,7 +8,7 @@ task count {
     String disk_size
 
     command <<<
-        python /count.py -s ${sample_id} -i ${readcount} -c ${bed} -o ${sample_id}.coverage
+        python /count_samtools.py -s ${sample_id} -i ${readcount} -c ${bed} -o ${sample_id}.coverage
     >>>
 
     runtime {