adjust README to reflect new options.

README.textile

@@ -14,6 +14,12 @@ Running:
 ./zktop.py --servers "localhost:2181,localhost:2182,localhost:2183"
 </pre>
 
+or, for a ZK-style configuration file:
+
+<pre>
+./zktop.py --config zk.conf
+</pre>
+
 shows a screen like:
 
 <pre>
@@ -49,11 +55,18 @@ h3. Usage
 Usage: zktop.py [options]
 
 Options:
-  -h, --help         show this help message and exit
-  --servers=SERVERS  comma separated list of host:port (default
-                     localhost:2181)
-  -n, --names        resolve session name from ip (default False)
-  --fix_330          workaround for a bug in ZK 3.3.0
+  -h, --help            show this help message and exit
+  --servers=SERVERS     comma separated list of host:port (default
+                        localhost:2181)
+  -n, --names           resolve session name from ip (default False)
+  --fix_330             workaround for a bug in ZK 3.3.0
+  -v VERBOSITY, --verbosity=VERBOSITY
+                        log level verbosity
+  -l LOGFILE, --logfile=LOGFILE
+                        directory in which to place log file, or empty for
+                        none
+  -c CONFIGFILE, --config=CONFIGFILE
+                        zookeeper configuration file to lookup servers from
 </pre>
 
 --fix_330 works around a bug in ZooKeeper 3.3.0, it is only necessary if running the server against that version of ZooKeeper.