use a valid nvm version ID instead of the deprecated one

ref. 9972de6dec > `stable`: this alias is deprecated
9 years ago · a73a01b31e
parent 423eb967a3
commit a73a01b31e
1 changed files with 1 additions and 1 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -1,7 +1,7 @@
 language: node_js
 node_js:
  - "6"
-  - "stable"
+  - "node"
 env:
  global:
    - BUILD_TIMEOUT=10000