Write new line separately, instead of adding to line string

lib/storage.js

@@ -93,7 +93,8 @@ storage.crashSafeWriteFileLines = (filename, lines, callback = () => {}) => {
           flags: 'w'
         })
         for (const line of lines) {
-          stream.write(line+'\n')
+          stream.write(line)
+          stream.write('\n')
         }
         stream.close(() => cb())
       } catch (err) {