Add note about lsof to be installed manually on centos8
@@ -56,3 +56,4 @@ Example trigger payload:
## Troubleshooting
* On CentOS7/RHEL7, dig is not installed by default. Run ``sudo yum install bind-utils`` to install.
+* On CentOS8/RHEL8, lsof is not installed by default. Run ``sudo yum install lsof`` to install.
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