bump to v0.13 in changelog as well

forgot to remove option -f from usage in readme

bug: a missing counter for started jobs

## v0.9 - July 06, 2022

- changed: now flushes the output of job message without buffering, useful for
  live monitoring and reading stdout the moment it is written
- new: added a "PKGBUILD" for use with `pacman`, can be used to generate an
  Archlinux package

## v0.8 - March 30, 2022 - standalone release

- new: pseudo compiled bundle of the script with pyinstaller to build a
  standalone executable, available on
  [Releases](https://github.com/thingsiplay/tochd/releases) page
- new: "Makefile" script for `make` to create the standalone bundle of Python
  script with the Python interpreter and package it into an archive
- changed: runs with default options `-X .`, if no options provided
- some little internal optimizations or additions, such as code comments