Update install commands and node version for testing

Author: samiahmedsiddiqui

.travis.yml

@@ -4,15 +4,14 @@ branches:
 dist: xenial
 language: node_js
 node_js:
-  - 12
-  - 13
-  - 14
+  - 16
+  - 18
   - node
 os:
   - linux
   - osx
 install:
-  npm install --dev
+  npm install --include=dev
 script:
   - npm run lint
   - npm run test

appveyor.yml

@@ -8,14 +8,13 @@ branches:
 environment:
   matrix:
     # node.js
-   - nodejs_version: "12"
-   - nodejs_version: "13"
-   - nodejs_version: "14"
+   - nodejs_version: "16"
+   - nodejs_version: "18"
    - nodejs_version: ""
 
 install:
   - ps: Install-Product node $env:nodejs_version
-  - npm install --also=dev
+  - npm install --include=dev
 
 test_script:
   - npm run lint