Update .travis.yml

try npm run lint instead of yarn

Author: ilarimikkonen

.travis.yml

@@ -1,6 +1,6 @@
 sudo: false
 
-dist: xenial
+#dist: xenial
 
 language: node_js
 node_js:
@@ -38,7 +38,7 @@ before_install:
 before_script:
 #Previously used yarn, but now after migrating to meteor 1.8, yarn fails to create some binaries.
   - meteor npm install
-  - yarn run lint
+  - npm run lint
   - npm view chimp version
   - npm view chromedriver version
   # Start X Virtual Frame Buffer for headless testing with real browsers