Replaces sed with something i think is more portable

Author: taz

bin/ghe-host-check

@@ -84,7 +84,7 @@ if [ $rc -ne 0 ]; then
   exit $rc
 fi
 
-version=$(echo "$output" | sed -E -n 's/GitHub Enterprise( Server)? version (.*)/\2/p')
+version=$(echo "$output" | head -1 | awk '{print $NF}')
 
 if [ -z "$version" ]; then
   echo "Error: failed to parse version on '$host' or this isn't a GitHub appliance." 1>&2