Update README.md

ipipdotnet · web-flow · commit b63640db5fc3 · 2023-03-13T10:19:59.000+08:00
diff --git a/README.md b/README.md
@@ -3,6 +3,7 @@ IPIP.net officially supported IP database ipdb format parsing library
 
 # Notice
 <pre>
+请直接用github上源码包
 报错请检查 fastjson 版本是否太低，请使用最新版本
 </pre>
 # Documents
