build: fix site not loading due to dataSource exception

Fixes #426

Author: Splaktar

.travis.yml

@@ -2,7 +2,7 @@ language: node_js
 sudo: false
 
 node_js:
-  - '6.9.1'
+  - '8.11.1'
 
 branches:
   only:
@@ -38,4 +38,4 @@ script:
 
 cache:
   directories:
-    - node_modules
+    - node_modules