Update mentors for brnrd

- Remove vsevolod as mentor for brnrd
  - Add feld as mentor for brnrd

Reviewed by:	koobs (mentor), vsevolod (mentor p.t.), feld (mentor h.t.)
Approved by:	koobs (mentor)
Differential Revision:	https://reviews.freebsd.org/D4702

share/misc/committers-ports.dot

@@ -349,6 +349,7 @@ erwin -> lbr
 erwin -> lth
 erwin -> simon
 
+feld -> brnrd
 feld -> junovitch
 
 fjoe -> danfe
@@ -584,8 +585,6 @@ thierry -> riggs
 tmclaugh -> itetcu
 tmclaugh -> xride
 
-vsevolod -> brnrd
-
 wen -> cs
 wen -> culot
 wen -> pawel