.travis.yml in neovim-0.8.0 vs .travis.yml in neovim-0.8.1

@@ -9,15 +9,17 @@
 rvm:
   - 2.2
   - 2.3
   - 2.4
   - 2.5
+  - 2.6
   - ruby-head
 
 before_install:
   - eval "$(curl --connect-timeout 30 --retry 3 -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) nightly-x64"
   - gem update --system --conservative || (gem install "rubygems-update:~>2.7" --no-document && update_rubygems)
-  - gem install --remote bundler
+  - gem install --remote bundler || gem install --remote bundler -v "1.17.3"
+  - gem install --user-install executable-hooks
   - bundle --version
 
 env: NVIM_RUBY_LOG_LEVEL=DEBUG NVIM_RUBY_LOG_FILE=ci.log
 script: bundle exec rake --trace