improve coverage (#168)

.github/workflows/lint.yml

@@ -13,6 +13,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - uses: actions/setup-go@v3
+      with:
+        go-version: "1.19"
+
     - uses: golangci/golangci-lint-action@v3
       with:
         version: v1.50.1

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        go: ["1.17", "1.18", "1.19"]
+        go: ["1.18", "1.19"]
 
     steps:
     - uses: actions/checkout@v2