Let people know how to bypass precommit hook

hooks/pre-commit

@@ -21,5 +21,7 @@ fi
 if [ -n "$uglyFiles" ]; then
     echo "Prettify your files first:"
     echo 'yarn run pretty'
+    echo ''
+    echo 'If you see this message repeatedly, skip the check with git commit -n'
     exit 1
 fi