Update travis for windows and node 11

cemremengu · cemremengu · commit 04605d9b9749 · 2019-01-05T19:42:49.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,14 @@
 language: node_js
 
 node_js:
-  - "8"
   - "6"
+  - "8"
   - "10"
+  - "11"
+
+os:
+  - linux
+  - windows
 
 script:
   - npm run coveralls
