.travis.yml in neovim-0.7.1 vs .travis.yml in neovim-0.8.0

- old
+ new

@@ -1,6 +1,7 @@
 language: ruby
+cache: bundler
 sudo: false
 dist: trusty
 
 branches:
   only: master
@@ -12,11 +13,11 @@
   - 2.5
   - 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
-  - gem update bundler
+  - gem update --system --conservative || (gem install "rubygems-update:~>2.7" --no-document && update_rubygems)
+  - gem install --remote bundler
   - bundle --version
 
-env: REPORT_COVERAGE=1 NVIM_RUBY_LOG_LEVEL=DEBUG NVIM_RUBY_LOG_FILE=ci.log
+env: NVIM_RUBY_LOG_LEVEL=DEBUG NVIM_RUBY_LOG_FILE=ci.log
 script: bundle exec rake --trace