.travis: fix config warning

[CI SKIP]
2020-02-19 17:37:52 +08:00 · 2020-02-19 17:37:52 +08:00 · bcc1ec65f9
parent e82c96dab1
commit bcc1ec65f9
1 changed files with 1 additions and 0 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -1,3 +1,4 @@
+os: linux
 language: go
 go:
  - 1.11.x