Update README.md

Author: c4yg70

README.md

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 SEU-Wiki
-本站在七日内上线时间比例![Uptime Robot ratio (7 days)](https://img.shields.io/uptimerobot/ratio/7/m782198135-db316fcf840f1b0e8451e4c9.svg)
+本站在七日内上线时间比例 ![Uptime Robot ratio (7 days)](https://img.shields.io/uptimerobot/ratio/7/m782198135-db316fcf840f1b0e8451e4c9.svg)
 # 三条盟约
 1. Law is Law. | 法律乃底线
 2. Rule is Rule | 有规方有缘