[goobook/f15] (5 commits) ...oops wrong place for sed

[helloworld1]

Summary of changes:

  b6d5f67... Remove argparse dependency (*)
  85d528f... Remove s in sed and add changelog (*)
  c37505d... change date (*)
  0cdabec... date change (*)
  57a2383... oops wrong place for sed (*)

(*) This commit already existed in another branch; no separate mail sent