Travis is currently busted with Node 9.

timdorr · josepot · commit f73a59390eb1 · 2018-09-21T23:18:49.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "node"
+  - "8"
 before_install:
   - npm i -g npm
 script:
