Bump supported Go versions

Author: nukosuke

.github/workflows/ci.yml

@@ -7,10 +7,10 @@ jobs:
     strategy:
       matrix:
         go-version:
-          - 1.18.x
           - 1.19.x
           - 1.20.x
           - 1.21.x
+          - 1.22.x
     runs-on: ubuntu-latest
     steps:
     - name: Set up Go 1.x

appveyor.yml

@@ -10,7 +10,7 @@ cache:
   - '%LocalAppData%\go-build'
   - '%GOPATH%\pkg\mod'
 
-stack: go 1.19
+stack: go 1.22
 
 install:
   - go mod download