(docs) updated readme to include new methods

Author: Corey Wilson

README.md

@@ -93,11 +93,16 @@ NetworkInfo.getIPAddress(ip => {
   console.log(ip);
 });
 
-// Get IPv4 IP (Android Only)
+// Get IPv4 IP
 NetworkInfo.getIPV4Address(ipv4 => {
   console.log(ipv4);
 });
 
+// Get Broadcast
+NetworkInfo.getBroadcast(address => {
+  console.log(address);
+});
+
 // Get SSID
 NetworkInfo.getSSID(ssid => {
   console.log(ssid);