Update fq generate record count option

[a-hariti]

the current syntax is deprecated as highlighted by this note from the command output:

********** NOTE: Picard's command line syntax is changing.
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********** For more information, please see:
********** https://github.com/broadinstitute/picard/wiki/Command-Line-Syntax-Transition-For-Users-(Pre-Transition)
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********** The command line looks like this in the new syntax:
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**********    MarkDuplicates -I SRR038564.bwa-mem.sorted.bam -O SRR038564.bwa-mem.sorted.marked.bam -M SRR038564.bwa-mem.sorted.marked.bam.metrics
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