log.format, error reporting

test/compress/big-file.txt

@@ -54,7 +54,7 @@ $ ws --help
 
 Server
 -p, --port <number>           Web server port
--f, --log-format <string>     If a format is supplied an access log is written to stdout. If not, a statistics view is displayed. Use a
+-f, --log.format <string>     If a format is supplied an access log is written to stdout. If not, a statistics view is displayed. Use a
                               preset ('none', 'dev','combined', 'short', 'tiny' or 'logstalgia') or supply a custom format (e.g. ':method ->
                               :url').
 -d, --directory <string>      Root directory, defaults to the current directory
@@ -90,11 +90,11 @@ $ ws --compress
 ```
 
 ### Logging
-Passing a value to `--log-format` will write an access log to `stdout`.
+Passing a value to `--log.format` will write an access log to `stdout`.
 
 Either use a built-in [morgan](https://github.com/expressjs/morgan) logger preset:
 ```sh
-$ ws --log-format short
+$ ws --log.format short
 ```
 
 Or a custom [morgan](https://github.com/expressjs/morgan) log format:
@@ -123,7 +123,7 @@ Or in a `.local-web-server.json` file stored in the directory you want to serve
 ```json
 {
   "port": 8100,
-  "log-format": "tiny"
+  "log.format": "tiny"
 }
 ```