Update README to new config format.

README.md

@@ -9,13 +9,13 @@ dcrseeder is a crawler for the Decred network, which exposes a list of reliable
 nodes via a built-in HTTP server.
 
 When dcrseeder is started for the first time, it will connect to the dcrd node
-specified with the `-s` flag, send a `getaddrs` request, expecting an  `addr`
+specified in config, send a `getaddrs` request, expecting an `addr`
 message response. This message contains hostnames and IPs of peers known by the
 node. dcrseeder will then connect to each of these peers, send a `getaddrs`
 request, and will continue traversing the network in this fashion. dcrseeder
 maintains a list of all known peers and periodically checks that they are
 online and available. The list is stored on disk in a json file, so on
-subsequent start ups the dcrd node specified with `-s` does not need to be
+subsequent start ups the dcrd node specified in config does not need to be
 online.
 
 When dcrseeder is queried for node information, it responds with details of a
@@ -33,11 +33,13 @@ root directory.
 To start dcrseeder listening on localhost:8000 with an initial connection to working testnet node 192.168.0.1:
 
 ```no-highlight
-$ ./dcrseeder -s 192.168.0.1 --testnet --httplisten=localhost:8000
+$ ./dcrseeder --testnet.enabled --testnet.seeder 192.168.0.1 --testnet.listen=localhost:8000
 ```
 
 You will then need to redirect HTTPS traffic on your public IP to localhost:8000
 
+An [example configuration file](./sample-dcrseeder.conf) lists the full set of options available.
+
 ## Issue Tracker
 
 The [integrated github issue tracker](https://github.com/decred/dcrseeder/issues)