修复已知问题

api/controllers/IssueChainController.php

@@ -38,7 +38,7 @@ class IssueChainController extends BaseController
 
         foreach ($chain_model as &$val) {
             $val->chain_name = isset($val->chain->platform) ? $val->chain->platform : '';
-            $val->issue_charge = $val->issue_charge;
+            $val->issue_charge = (float)sprintf("%0.3f", $val->issue_charge);
             $val->charge_unit = isset($val->gas->coin_name) ? $val->gas->coin_name : '';
             unset($val->download_url);
             unset($val->introduce);