specify bundler version

X1ting · X1ting · commit e55be77ed8c7 · 2019-04-26T14:43:16.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -21,7 +21,7 @@ before_install:
   - tsql -C
 install:
   - export PATH=/opt/local/bin:$PATH
-  - gem install bundler
+  - gem install bundler -v 1.17.3
   - bundle --version
   - bundle install
 script:
