ci(travis): Node 11 (on OS X) crashes, use 10 for now (#1588)

Author: odinho

.travis.yml

@@ -18,7 +18,9 @@ jobs:
       stage: Test (MacOS)
       os: 'osx'
       env: SCRIPT=test
-      node_js: 'stable'
+      # Node 10 instead of 'stable' since Node 11 segfaults
+      # https://github.com/webpack/webpack-dev-server/pull/1588
+      node_js: 10
     - <<: *osx
       node_js: 'lts/*'
     - <<: *osx