build: update Go version to 1.18 and GitHub workflow matrix

Author: robinlieb

.github/workflows/workflow.yml

@@ -23,7 +23,7 @@ jobs:
     name: Test
     strategy:
       matrix:
-        go-version: [1.17.x, 1.18.x, 1.20.x]
+        go-version: [1.18.x, 1.19.x, 1.20.x, 1.21.x, 1.22.x]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:

go.mod

@@ -1,6 +1,6 @@
 module github.com/go-playground/webhooks/v6
 
-go 1.17
+go 1.18
 
 require (
 	github.com/gogits/go-gogs-client v0.0.0-20200905025246-8bb8a50cb355