chore: Run tests CI also for node 18

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [14, 16]
+        node: [14, 16, 18]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [14, 16]
+        node: [14, 16, 18]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
@@ -60,7 +60,7 @@ jobs:
   #   runs-on: ubuntu-latest
   #   strategy:
   #     matrix:
-  #       node: [14, 16]
+  #       node: [14, 16, 18]
   #   steps:
   #     - uses: actions/checkout@v2
   #     - uses: actions/setup-node@v2