Handle multi-level links

Author: Manishearth

provider/src/data/debug/iana_normalizer.json

@@ -731,7 +731,7 @@
     ],
     [
       257,
-      256
+      313
     ],
     [
       259,

provider/src/data/debug/iana_normalizer.txt

@@ -633,7 +633,7 @@ Asia/Ashkhabad => Asia/Ashgabat
 Asia/Calcutta => Asia/Kolkata
 Asia/Choibalsan => Asia/Ulaanbaatar
 Asia/Chongqing => Asia/Shanghai
-Asia/Chungking => Asia/Chongqing
+Asia/Chungking => Asia/Shanghai
 Asia/Dacca => Asia/Dhaka
 Asia/Harbin => Asia/Shanghai
 Asia/Istanbul => Europe/Istanbul