Changed usage

README.md

@@ -1,13 +1,4 @@
 # libstdc++
 Xcode10中删除的`libstdc++`库
 
-其中文件夹 1、2、3、4 中的文件分别对应复制到Xcode10中的以下4个目录中即可：
-```
-/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/
-
-/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/
-
-/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/
-
-/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/
-```
+直接运行 `sh install.sh` 即可。