Only test n-1 Go versions

.github/workflows/test.yml

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6a407f0..350375d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,7 +5,7 @@
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.16.x, 1.17.x, 1.18.x]
+        go-version: [1.17.x, 1.18.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps: