Update PLAN.md according to the meeting

planning/PLAN.md

@@ -145,19 +145,13 @@
 
 
 # What to add?
-+ more on branches
 + git clean
-+ git stash
 + more on GitHub, GitLab, (Bitbucket?)
   * pull requests
   * ...
 + from the current tips and tricks:
   * git blame
-  * git tag
   * git diff -w
-  * ammend
-  * modifying global ignore
-  * commands aliases
 
 
 # What to remove?
@@ -165,27 +159,27 @@
 
 # Next course program
 
-## (10:00 - 10:30) Introduction - 
+## (10:00 - 10:30) Introduction - Mihai
 
-## (10:30 - 11:15) Git basics - 
+## (10:30 - 11:15) Git basics - Bowo
 
 ## (11:15 - 12:00) Practical 
 
 ## (12:00 - 13:00) Lunch 
 
-## (13:00 - 13:45) Collaboration: remotes -
+## (13:00 - 13:45) Collaboration: remotes - Jonathan
 
 ## (13:45 - 14:15) Practical 
 
 ## (14:15 - 14:30) Break
 
-## (14:30 - 15:15) Collaboration: merging -
+## (14:30 - 15:15) Collaboration: merging - Mihai
 
 ## (15:15 - 15:45) Practical 
 
 ## (15:45 - 16:00) Break 
 
-## (16:00 - 16:30) Tips? -
+## (16:00 - 16:30) Markdown, GitLab - Mihai
 
 ## (15:30 - 16:00) Practical