[DATALAD RUNCMD] Autoupdate readme

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "./.update-readme-help.py",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

README.md

@@ -149,8 +149,7 @@ positional arguments:
   {pp,plot,ls}  Available subcommands
     pp          Pretty print a JSON log.
     plot        Plot resource usage for an execution.
-    ls          Print execution information for all runs matching
-                DUCT_OUTPUT_PREFIX.
+    ls          Print execution information for all matching runs.
 
 options:
   -h, --help    show this help message and exit