docs(readme.md): 添加如何切换方案的描述

kur-archive · Sep 14, 2019 · f38eb5c · f38eb5c
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diff --git a/README.md b/README.md
@@ -12,6 +12,10 @@
 
 ```bash
 composer require kurisu/captcha_reader
+
+#该库依赖 php-gb 扩展
+# 如果是 linux 版本, php 可能未安装 php-gb
+sudo apt install php-gb -y #自行选择合适的安装方式
 ```
 
 ## 对各种验证码的支持