.travis.yml in neovim-0.5.1 vs .travis.yml in neovim-0.6.0

- old
+ new

@@ -14,8 +14,10 @@
   - 2.4
   - ruby-head
 
 before_install:
   - eval "$(curl -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) nightly-x64"
+  - gem update bundler
+  - bundle --version
 
-env: REPORT_COVERAGE=1
+env: REPORT_COVERAGE=1 NVIM_RUBY_LOG_LEVEL=DEBUG NVIM_RUBY_LOG_FILE=ci.log
 script: bundle exec rake --trace