Sync date of template.info.txt with dokuwiki repository

Sync this date to date in Dokuwiki repository ie : "Last updated on" on this page
https://www.dokuwiki.org/template:dokuwikiboostrap-simplified

see this posting on the forum : https://forum.dokuwiki.org/post/44026;nocount
Merge pull request #5 from Rene-dw/patch-1

Sync date of template.info.txt with dokuwiki repository