re-added node 10

.travis.yml

@@ -1,6 +1,8 @@
 
 language: node_js
 dist: xenial
+node_js:
+  - 10
 
 before_script:
     - curl -L "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/shunit2/shunit2-2.1.6.tgz" | tar zx