Use Go 1.18 (#5)

Signed-off-by: 1gtm <[email protected]>

Author: 1gtm

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:
-          go-version: ^1.17
+          go-version: ^1.18
         id: go
 
       - uses: actions/checkout@v2