Add Xuwei Fu as committer (#446)

Add me as a committer

I work for a startup, so just fill affiliation as unknown, thanks!
diff --git a/_data/committers.yml b/_data/committers.yml
index 7fc5c6e..b5f9d38 100644
--- a/_data/committers.yml
+++ b/_data/committers.yml
@@ -408,6 +408,10 @@
   role: Committer
   alias: xudong963
   affiliation: ByteDance
+- name: Xuwei Fu
+  role: Committer
+  alias: mwish
+  affiliation: Unknown
 - name: Yanghong Zhong
   role: Committer
   alias: nju_yaho