Added Bulgarian phone format (#8775)

data/phone_formats.json

@@ -5,6 +5,7 @@
   "at": "+43 1 123 45 67",
   "au": "+61 1 2345 6789",
   "bb": "+1-246-555-1234",
+  "bg": "+359 87 654 3210",
   "bj": "+229 20 12 34 56",
   "bm": "+1-441-555-1234",
   "bo": "+591 1 2345678",
@@ -63,4 +64,4 @@
   "vi": "+1-340-555-1234",
   "vn": "+84 1 234 5678",
   "za": "+27 11 907 1111"
-}
+}