travis: use node 8.9

sushantdhiman · web-flow · commit 410af1b61b0f · 2018-01-12T10:27:57.000+05:30
diff --git a/.travis.yml b/.travis.yml
@@ -11,7 +11,7 @@ matrix:
     env: LINT=0
   - node_js: "6.11"
     env: LINT=0
-  - node_js: "8.0"
+  - node_js: "8.9"
     env: LINT=1
 
 cache:
