ci: don't lint on older node; do preserve failed test

.travis.yml

@@ -12,3 +12,13 @@ node_js:
   - 8
   - 6
   - 4
+
+script:
+  # Avoid linting on older node
+  - |
+    nodever=$(node --version | cut -d. -f1)
+    if [[ $nodever == v12 ]]; then
+      npm run test
+    else
+      node ./bin/cli.js
+    fi

appveyor.yml

@@ -1,20 +1,21 @@
 environment:
   matrix:
+  - nodejs_version: ''
   - nodejs_version: 7
   - nodejs_version: 6
   - nodejs_version: 4
 
 install:
-  - ps: Install-Product node $env:nodejs_version
+  - ps: if ($env:nodejs_version -like '') { Install-Product node $env:nodejs_version }
   - npm i -g npm@3
   - npm install
   - set CI=true
 
 test_script:
   - node --version
   - npm --version
-  - npm run lint
-  - "node lib\\cli.js || ver > null"
+  - ps: if ($env:nodejs_version -like '') { npm run lint }
+  - "node bin/cli.js || ver > null"
   - "echo Exit code: %errorlevel%"
 
 build: off

package.json

@@ -11,7 +11,7 @@
   "scripts": {
     "lint": "xo ./lib/**/*.js",
     "lint:fix": "xo ./lib/**/*.js --fix",
-    "test": "npm run lint && ./bin/cli.js || echo Exit Status: $?.",
+    "test": "npm run lint && ./bin/cli.js || { ev=$?; echo \"Exit status: $ev\">&2; exit $ev }",
     "transpile": "babel lib --out-dir lib-es5",
     "watch": "babel lib --out-dir lib-es5 --watch",
     "prepare": "npm run transpile"