refactor: rename UptimeFormatter.js to uptimeFormatter.js

handlers/uptimeFormatter.js

@@ -10,4 +10,4 @@ module.exports = function uptimeFormatter(time) {
     if (text.length > 0) text.push(`and ${seconds} seconds`)
     else text.push(`${seconds} seconds`)
     return text.join(", ").replace(", and", " and")
-}
+}