Typo

README.md

@@ -16,7 +16,7 @@
     dig +short myip.opendns.com @resolver1.opendns.com
     ```
 
-* Check if private and public ssh key match:
+* Check if private and public ssh keys match:
 
     ```
     diff <(cat ~/.ssh/id_rsa.pub | cut -d' ' -f 2) <(ssh-keygen -y -f ~/.ssh/id_rsa | cut -d' ' -f 2)'