chore(ci): add node 18

Author: mjeanroy

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
     strategy:
       matrix:
         os: [ windows-latest, ubuntu-latest, macos-latest ]
-        node: [ 10, 11, 12, 13, 14, 15, 16, 17 ]
+        node: [ 10, 11, 12, 13, 14, 15, 16, 17, 18 ]
     steps:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1