Build against go 1.18

Author: tech10

.github/workflows/build.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.15.15, 1.17.5]
+        go-version: [1.15.15, 1.18]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps: