Update README.md (#163)

* Update README.md 增加互亿无线短信的签名支持 * Update README.md

Update README.md (#163)
* Update README.md 增加互亿无线短信的签名支持 * Update README.md
078abd52 · srt · 安正超 · a1d2f3f6 · 078abd52
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README.md README.md +1 -0

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--- a/README.md
+++ b/README.md
@@ -393,6 +393,7 @@ $easySms->send(13188888888, $message);
    'huyi' => [
        'api_id' => '',
        'api_key' => '',
+        'signature' => '',
    ],
 ```