I got sick of every time this happened to have to go into known_hosts and delete that entry. ssh will always tell you the line number that contains the conflicting key, so all i have to do is delete that line from known_hosts and bam. i'm done. So i came up with this little function to make my life easier:
if [[ -z $1 ]]; then
echo 'Deletes the specified linenumber from ~/.ssh/known_hosts'
echo 'Usage: ssh-del-line linenumber'
sed -i "/$1/d" ~/.ssh/known_hosts
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