build: update minimum Go version to 1.19

- Update the Go version support in GitHub Actions workflow from `1.18, 1.19, "1.20", 1.21, 1.22` to `1.19, "1.20", 1.21, 1.22`
- Add a "Requirement" section in the README stating the requirement for Go **1.19** or later
- Update the Go version in `go.mod` from `1.18` to `1.19`

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

.github/workflows/go.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: [1.18, 1.19, "1.20", 1.21, 1.22]
+        go: [1.19, "1.20", 1.21, 1.22]
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build

README.md

@@ -7,6 +7,10 @@
 
 Alternative logging through [zap](https://github.com/uber-go/zap). Thanks for [Pull Request](https://github.com/gin-gonic/contrib/pull/129) from [@yezooz](https://github.com/yezooz)
 
+## Requirement
+
+Require Go **1.19** or later.
+
 ## Usage
 
 ### Start using it

go.mod

@@ -1,6 +1,6 @@
 module github.com/gin-contrib/zap
 
-go 1.18
+go 1.19
 
 require (
 	github.com/gin-gonic/gin v1.9.1