Update io.github.KangLin.SerialPortAssistant.metainfo.xml.in

Author: KangLin

share/metainfo/io.github.KangLin.SerialPortAssistant.metainfo.xml.in

@@ -15,7 +15,7 @@
     <p xml:lang="zh_CN">串口助手提供跨平台的图形界面，用于与串口设备通信。</p>
     <p xml:lang="zh_TW">串口助手提供跨平臺的圖形界面，用於與串口設備通信。</p>
   </description>
-  <developer>
+  <developer id="io.github.KangLin">
     <name>KangLin</name>
     <name xml:lang="zh_CN">康林</name>
     <name xml:lang="zh_TW">康林</name>
@@ -31,6 +31,7 @@
   <screenshots>
     <screenshot type="default">
       <image>https://raw.githubusercontent.com/KangLin/SerialPortAssistant/refs/heads/master/Docs/ui-en.jpg</image>
+      <caption>Main</caption>
     </screenshot>
   </screenshots>