docs: update documentation and configuration for latest release

- Change changelog source from git to GitHub in `.goreleaser.yaml`
- Update download links in `README.md` to use gorush version 1.18.9
- Update Go version requirement in `README.md` to at least Go 1.22

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

.goreleaser.yaml

@@ -88,7 +88,7 @@ snapshot:
   version_template: "{{ incpatch .Version }}"
 
 changelog:
-  use: git
+  use: github
   groups:
     - title: Features
       regexp: "^.*feat[(\\w)]*:+.*$"

README.md

@@ -260,27 +260,27 @@ go install github.com/appleboy/gorush
 On linux
 
 ```sh
-wget https://github.com/appleboy/gorush/releases/download/v1.16.3/gorush-1.16.3-linux-amd64 -O gorush
+wget https://github.com/appleboy/gorush/releases/download/v1.18.9/gorush-1.18.9-linux-amd64 -O gorush
 ```
 
 On macOS (Intel amd64)
 
 ```sh
-wget -c https://github.com/appleboy/gorush/releases/download/v1.16.3/gorush-1.16.3-darwin-amd64 -O gorush
+wget -c https://github.com/appleboy/gorush/releases/download/v1.18.9/gorush-1.18.9-darwin-amd64 -O gorush
 ```
 
 On macOS (Apple arm64)
 
 ```sh
-wget -c https://github.com/appleboy/gorush/releases/download/v1.16.3/gorush-1.16.3-darwin-arm64 -O gorush
+wget -c https://github.com/appleboy/gorush/releases/download/v1.18.9/gorush-1.18.9-darwin-arm64 -O gorush
 ```
 
 ### Install from source
 
 #### Prerequisite Tools
 
 - [Git](http://git-scm.com/)
-- [Go (at least Go 1.21)](https://go.dev/dl/)
+- [Go (at least Go 1.22)](https://go.dev/dl/)
 
 #### Fetch from GitHub