added 'secs' to the reported time

diff --git a/core/countReads.sh b/core/countReads.sh
index 807c7b0..7f557da 100755
--- a/core/countReads.sh
+++ b/core/countReads.sh
@@ -267,6 +267,6 @@ endTime=`date +%s`

 runtime=$((endTime-startTime))

-echo "Total runtime: $runtime"
+echo "Total runtime: $runtime secs"

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