MINOR: Update Yuanping Wu from the committer to PMC in site

Author: ffacs

site/develop/committers.md

@@ -21,7 +21,7 @@ Deshan Xiao             | deshanxiao   | Committer
 Dongjoon Hyun           | dongjoon     | PMC
 Deepak Majeti           | mdeepak      | PMC
 Eugene Koifman          | ekoifman     | PMC
-Yuanping Wu             | ffacs        | Committer
+Yuanping Wu             | ffacs        | PMC
 Gang Wu                 | gangwu       | PMC
 Gopal Vijayaraghavan    | gopalv       | PMC
 Gunther Hagleitner      | gunther      | Committer