updated README (CiscoDevNet#9)

* Updated README

* updated README

Author: krishna426426

PortFlap_email_alert/README.md

@@ -1,21 +1,25 @@
-#  port_flap_email_alert script will send an email alert if an interface is flapping
+# port_flap_email_alert script will send an email alert if an interface is flapping
 
 If an interface has flapped 5 times in last 5 minutes this script will shutdown that interface. You can change the flapping count to whatever you want. Then the script will wait for 5 mins and enable the shutdown interface. If that interface still flapping at least once script will shutdown the interface and will send an email alert.
 
+## requirements
+
+-- IOS-XE running >/= 16.5.1
+
 ## Setup 
 
-This script requires the IOS-XE guestshell feature. To enable guestshell, configure
+* This script requires the IOS-XE guestshell feature. To enable guestshell, configure
 
     ```
    iox
-    ```
+    ```       
 
-Then type the following in EXEC mode:
+* Then type the following in EXEC mode:
 
     ```
    guestshell enable
     ```
 
-Save the script port_flap_email_alert.py in guestshell.
+* Save the script port_flap_email_alert.py in guestshell.
 
-Next, configure the EEM environment using  EEM_configuration file. Embedded Event Manager (EEM) is a distributed and customized approach to event detection and recovery. EEM offers the ability to monitor events and take informational, corrective, or any desired EEM action when the monitored events occur or when a threshold is reached. 
+* Next, configure the EEM environment using  EEM_configuration file. Embedded Event Manager (EEM) is a distributed and customized approach to event detection and recovery. EEM offers the ability to monitor events and take informational, corrective, or any desired EEM action when the monitored events occur or when a threshold is reached.