ci: add nodejs18 as it is released

abetomo · abetomo · commit 06cf75152839 · 2022-04-21T15:13:59.000+09:00
Drop nodejs17 as it will be eol soon.
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [12.x, 14.x, 16.x, 17.x]
+        node-version: [12.x, 14.x, 16.x, 18.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
