update patch.md link

Author: dustinxie

changelog/v1.8-release-note.md

@@ -46,5 +46,5 @@ v1.8.2 is a regular maintenance release
 [#3465](https://github.com/iotexproject/iotex-core/pull/3465))
 
 ## v1.8.4 Release Note
-v1.8.4 is a hot-fix release, see [here](https://github.com/iotexproject/iotex-bootstrap/v1.8.4/184_patch/patch.md)
+v1.8.4 is a hot-fix release, see [here](https://github.com/iotexproject/iotex-bootstrap/blob/v1.8.4/184_patch/patch.md)
 for details and upgrade instruction.