Added group "call" validator.

bungle · bungle · commit 42df093784aa · 2017-08-25T23:12:55.000+03:00
diff --git a/lib/resty/validation.lua b/lib/resty/validation.lua
@@ -684,6 +684,9 @@ function group:requisites(r, n)
         end
     end
 end
+function group:call(func)
+    self[#self+1] = func
+end
 function group:__call(data)
     local results = setmetatable({}, fields)
     local validators = self.validators
