update README.md

Author: Bryce Larson

README.md

@@ -10,6 +10,5 @@ iptables.
 
 To install:
 ```
-wget https://github.com/bryceml/sshguard-rhel7/raw/master/RPMS/x86_64/sshguard-1.7.1-1.el7.x86_64.rpm
-yum install sshguard-1.7.1-1.el7.x86_64.rpm
+rpm -i https://github.com/bryceml/sshguard-rhel7/raw/master/RPMS/x86_64/sshguard-1.7.1-1.el7.x86_64.rpm
 ```