added today's lecture
Merge branch 'master' of https://github.com/JaMeZ-B/latex-wwu

# By Tazdr (2) and JaMeZ-B (1)
* 'master' of https://github.com/JaMeZ-B/latex-wwu:
  Revert "somethings changed"
  somethings changed
  prolog added, bug fixed