Amend Derek users in .DEREK.yml file

Addressing issue #824, added bartsmykla, LucasRoesler, s8sg, viveksyngh, 
removed ovation22, cpitkin, jockdarock, itscaro

Signed-off-by: Stanton Xu <xjiefeng@gmail.com>

.DEREK.yml

@@ -2,19 +2,19 @@ maintainers:
  - alexellis
  - rgee0
  - johnmccabe
- - jockdarock
  - ericstoekl
- - itscaro
  - kenfdev
  - BurtonR
  - ivanayov
  - stefanprodan
- - ovation22
- - cpitkin
  - affix
  - viveksyngh
  - martindekov
  - ewilde
+ - bartsmykla
+ - LucasRoesler
+ - s8sg
+ - viveksyngh
 
 features:
  - dco_check