Update Uzbekistan.json (#229)

Districts of capital town agreed to be on the same administrative level as other districts of Uzbekistan, all admin_lelvel=8 updated to 6

Author: acamat

ExpectedStateOfAdmins/Uzbekistan.json

@@ -212,7 +212,20 @@
       15639559,
       18507227,
       18507147,
-      7726941
+      7726941,
+      1751444,
+      2434059
+      2439529,
+      2441651,
+      2441810,
+      2443769,
+      2447546,
+      2447560,
+      2447634,
+      2448072,
+      5620904,
+      12030887,
+      17389398
     ]
   }
 }