update travis

Author: izaakschroeder

.travis.yml

@@ -2,7 +2,8 @@ sudo: false
 language: node_js
 matrix:
   include:
-    - node_js: '6'
+    - node_js: '8'
+    - node_js: '10'
+
 after_success:
-  - cat ./coverage/coverage.json | ./node_modules/.bin/adana -F adana-format-istanbul > ./coverage/istanbul.json
-  - bash <(curl -s https://codecov.io/bash) -f ./coverage/istanbul.json
+  - bash <(curl -s https://codecov.io/bash)