* Update addons sponsor

Author: seanpmorgan

sigs/addons/CHARTER.md

@@ -31,7 +31,7 @@ Everybody with an interest in helping extend TensorFlow with new types of Ops, L
 
 * Project leads: Sean Morgan [@seanpmorgan](https://github.com/seanpmorgan),
   Yan Facai (颜发才) [@facaiy](https://github.com/facaiy)
-* TensorFlow technical contact [@karmel](https://github.com/karmel) - karmel@google.com
+* TensorFlow technical contact [@tomerk](https://github.com/tomerk) - kaftan@google.com
 * For administrative questions, contact Edd Wilder-James [@ewilderj](https://github.com/ewilderj) - ewj at google
 
 ## Archive