Use the right Node version.

sebadoom · sebadoom · commit b4711d33b90f · 2018-02-26T13:36:22.000-03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-    - "latest"
+    - "stable"
 before_script:
     - echo "Host github.com" >> ~/.ssh/config
     - echo "  StrictHostKeyChecking no" >> ~/.ssh/config
