Attempt to fix Travis build failed cause by update gem system 4

mkdika · mkdika · commit 17bfe110900d · 2019-12-17T07:18:18.000+07:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,8 +5,7 @@ rvm:
   - 2.6.5
 
 before_install:
-  - gem update --system
-  - bundle
+  - bundle install
 
 before_script:
   - pip install --user codecov
