update go version for ci

Author: schollz

.github/workflows/ci.yml

@@ -13,6 +13,6 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-go@v2
       with:
-        go-version: '1.17'
+        go-version: '1.18'
     - run: go version
     - run: go test -v -cover .