Update addons owners (#85)

Add Yan Facai as another project lead.

Author: seanpmorgan

sigs/addons/CHARTER.md

@@ -29,8 +29,9 @@ Everybody with an interest in helping extend TensorFlow with new types of Ops, L
 
 ## Contacts
 
-* Project leads: Sean Morgan [@seanpmorgan](https://github.com/seanpmorgan) - [email protected],
-  Armando Fandango [@armando-fandango](https://github.com/armando-fandango) - [email protected]
+* Project leads: Sean Morgan [@seanpmorgan](https://github.com/seanpmorgan),
+  Armando Fandango [@armando-fandango](https://github.com/armando-fandango),
+  Yan Facai (颜发才) [@facaiy](https://github.com/facaiy)
 * TensorFlow technical contact [@karmel](https://github.com/karmel) - [email protected]
 * For administrative questions, contact Edd Wilder-James [@ewilderj](https://github.com/ewilderj) - ewj at google