update readme

README.md

@@ -12,12 +12,26 @@ fuck.
 
 ```sh
 $ ./main.py -h
-usage: hhirlstats [-h] [-v] [-c] [-Q {gametime,moves,nicknames,playtime,usage}] [replay ...]
+usage: hhirlstats [-h] [-v] [-C] [-o FILE] replay [replay ...]
+
+extracts stats from a Showdown replay
+
+positional arguments:
+  replay                replay ID or URL
+
+options:
+  -h, --help            show this help message and exit
+  -v, --verbose         add debugging info (default: None)
+  -C, --no-cache        fetch replays instead of using cache (default: False)
+  -o FILE, --output FILE
+                        output data file (default: data.db)
 ```
 
-Recommended to cache replays (`-c`) to save issuing requests to Showdown on every query.
+Replay files are cached after they're downloaded for the first time save issuing
+requests to Showdown on every new run.
 
-Run the program once with all your replays (or once for each replay), then start querying.
+Run the program once with all your replays (or once for each replay), then run
+whatever SQL queries against the data file (default `data.db`) you want.
 
 ## Future work