adjusts node version

hirako2000 · hirako2000 · commit eec1b9eee12c · 2020-10-19T17:42:57.000+07:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@
 sudo: false
 language: node_js
 node_js:
-  - "7.10.1"
+  - "12.12.0"
 
 cache:
   directories:
