Add Go 1.18 to GitHub Actions

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       max-parallel: 4
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        go-version: [1.16, 1.17]
+        go-version: [1.16, 1.17, 1.18]
     steps:
     - name: Set up Go
       uses: actions/setup-go@v2

.github/workflows/linters.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.17
       - uses: golangci/golangci-lint-action@v2
         with:
           args: --skip-dirs tests --disable errcheck --enable sqlclosecheck --enable misspell --enable gofmt --enable goimports --enable whitespace