README: Mention use of caching for developing workflows.

* README.md: Mention use of caching for developing workflows.

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 ravanan (pronounced rah-vun-un, IPA: rɑːvʌnʌn, Shavian: 𐑮𐑭𐑝𐑳𐑯𐑳𐑯) is a [Common Workflow Language (CWL)](https://www.commonwl.org/) implementation that is powered by [GNU Guix](https://guix.gnu.org/) and provides strong reproducibility guarantees. ravanan provides strong bullet-proof caching ([work reuse](https://www.commonwl.org/v1.2/CommandLineTool.html#WorkReuse)) so you never run the same step of your workflow twice, nor do you have to keep track of which steps were run and with what parameters: ravanan remembers everything for you. ravanan captures logs from every step of your workflow so you can always trace back in case of job failures.
 
 Salient features of ravanan include:
-- Bullet-proof caching; never run the same computation again and never fear that the cache is stale (no kidding, we're serious!)
+- Bullet-proof caching; never run the same computation again and never fear that the cache is stale (no kidding, we're serious!). This is especially useful when developing a workflow and you want to iterate by repeatedly running slightly modified workflows.
 - Each step in your CWL corresponds to exactly one job on the batch system.
 - Clear logging; you never have to hunt for log files in obscure directories or binary databases.
 - Jobs do not directly write to the shared network filesystem; keeps performance good and your fellow HPC users happy