Merge pull request #13755 from atom/as-lint-everywhere

Run `script/lint` also on AppVeyor and Travis

.travis.yml

@@ -19,7 +19,9 @@ install:
   - npm install -g npm
   - script/build --create-debian-package --create-rpm-package --compress-artifacts
 
-script: script/test
+script:
+  - script/lint
+  - script/test
 
 cache:
   directories:

appveyor.yml

@@ -27,6 +27,7 @@ build_script:
   - script\build.cmd --code-sign --create-windows-installer --compress-artifacts
 
 test_script:
+  - script\lint.cmd
   - script\test.cmd
 
 deploy: off