[代码完善](master): 修改默认配置为php-ext

Author: isettle

README.md

@@ -21,7 +21,7 @@ $corpConfig = [
 ];
 ## 包配置
 $srcConfig = [
-    'default'   => 'php-ffi',
+    'default'   => 'php-ext',
     'providers' => [
         'php-ext' => [
             'driver' => \MoChat\WeWorkFinanceSDK\Provider\PHPExtProvider::class,

publish/wx_finance_sdk.php

@@ -9,7 +9,7 @@
  * @license  https://github.com/mochat-cloud/mochat/blob/master/LICENSE
  */
 return [
-    'default'   => 'php-ffi',
+    'default'   => 'php-ext',
     'providers' => [
         'php-ext' => [
             'driver' => \MoChat\WeWorkFinanceSDK\Provider\PHPExtProvider::class,

src/WxFinanceSDK.php

@@ -36,7 +36,7 @@ class WxFinanceSDK
     public function __construct(array $config = [])
     {
         $default = [
-            'default'   => 'php-ffi',
+            'default'   => 'php-ext',
             'providers' => [
                 'php-ext' => [
                     'driver' => \MoChat\WeWorkFinanceSDK\Provider\PHPExtProvider::class,