Commits on Apr 12, 2018

1. Address LoadError: cannot load such file -- bundler/dep_proxy …

   CI with `ruby-head` is getting this error https://travis-ci.org/mikel/mail/jobs/359195509
   ```ruby
   $ bundle exec rake
   bundler: failed to load command: rake (/home/travis/build/mikel/mail/vendor/bundle/ruby/2.6.0/bin/rake)
   LoadError: cannot load such file -- bundler/dep_proxy
   ```
   It is likely duplicate with
   travis-ci/travis-ci#8969

   

   yahonda committed Apr 12, 2018
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