fix: travis ci

L3au · L3au · commit 3a2ad92623e0 · 2019-06-11T22:51:08.000+08:00
upgrade Node to 8+
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,7 @@
 sudo: false
 language: node_js
 node_js:
-  - '4'
-  - '6'
-  - '7'
+  - '8'
+  - '10'
 after_script:
   - npm i codecov && codecov
