Update documentation.

README.md

@@ -18,6 +18,7 @@ The WanMonitor provides the following capabilities:
 
 All configuration is done in /etc/config/wanmonitor file. Options available:
 * check_host - IP address of remote host used to check Internet connectivity
+* flapping - Number of seconds to wait after switching WAN to reduce link flapping
 * interval - Number of seconds to wait between checks
 * sleep - number of seconds to wait for slow links during startup
 * wan_primary - Primary WAN interface name to use
@@ -52,6 +53,7 @@ save mobile traffic).
 /etc/config/wanmonitor:
 	config wanmonitor
         option check_host '8.8.8.8'
+        option flapping '60'
         option interval '5'
         option sleep '5'
         option wan_primary 'wan1'