ci: remove old node version unsupported by angular

fknop · web-flow · commit 549d277837e0 · 2018-11-15T11:00:12.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,9 @@
 language: node_js
 node_js:
-  - 7
   - 8
   - 9
+  - 10
+  - 11
 
 cache: 
   yarn: true
