message: fix markdown format
  Add missed back-slash.
diff: @@ -6,7 +6,7 @@ The Nydusify CLI tool supports:
  ### Get binaries from release page
  -Get `nydus-image`, `nydusd` and `nydusify` binaries from [release](https://github.com/dragonflyoss/image-service/releases/latest) page and install them to system PATH like `/usr/bin` or /usr/local/bin`.
  +Get `nydus-image`, `nydusd` and `nydusify` binaries from [release](https://github.com/dragonflyoss/image-service/releases/latest) page and install them to system PATH like `/usr/bin` or `/usr/local/bin`.
  ## Basic Usage
  