remove silly space

distclean shouldn't fail if it does nothing

remove deprecated TODO item

Fix !6

0.9.1

* implement undo for filtering (`N,M!sh`)
* fix filtering only part of the file and the shell command not outputing anything
* fix `nmake clean` deleting the dist build
* added CHANGELOG
* launched jaked with a shell command doesn't persist the command as the default filename

make dist