docs: fix output format

Author: adthrasher

README.md

@@ -42,7 +42,7 @@
 
 - **[`ngs convert`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-convert).** Convert between next-generation sequencing formats.
 - **[`ngs derive`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-derive).** Forensic analysis tool for next-generation sequencing data.
-- **[`ngs generate`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-generate).** Generates a BAM file from a given reference genome.
+- **[`ngs generate`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-generate).** Generates FASTQ output from a given reference genome.
 - **[`ngs index`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-index).** Generates the index file to various next-generation sequencing files.
 - **[`ngs list`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-list).** Utility to list various supported items in this command line tool.
 - **[`ngs plot`](https://github.com/stjude-rust-labs/ngs/wiki/ngs-plot).** Produces plots for data generated by `ngs qc`.