Remove node 18 from travis CI - fails to install

Author: mattheu

.travis.yml

@@ -40,12 +40,3 @@ jobs:
         - cd ../..
       script:
         - npm test
-    - language: node_js
-      node_js: 18
-      install:
-        - npm install
-        - cd packages/eslint-config-humanmade
-        - npm install --legacy-peer-deps
-        - cd ../..
-      script:
-        - npm test