Features:

• Configure Bundler home, cache, config and plugin directories with BUNDLE_USER_HOME, BUNDLE_USER_CACHE, BUNDLE_USER_CONFIG and BUNDLE_USER_PLUGIN env vars (#4333, @gwerbin)
• Add --all option to bundle binstubs that will generate an executable file for all gems with commands in the bundle
• Add bundle remove command to remove gems from the Gemfile via the CLI
• Improve checking file permissions and asking for sudo in Bundler when it doesn't need to
• Add error message to bundle add to check adding duplicate gems to the Gemfile
• When asking for sudo, Bundler will show a list of folders/files that require elevated permissions to write to.
• Check folder/file permissions of the Bundle home directory in the bundle doctor command (#5786, @ajwann)
• Remove compiled gem extensions when running bundle clean (#5596, @akhramov)
• Add --paths option to bundle list command (#6172, @colby-swandale)
• Add base error class to gems generated from bundle gem (#6260, @christhekeele)
• Correctly re-install gem extensions with a git source when running bundle pristine (#6294, @wagenet)
• Add config option to disable platform warnings (#6124, @agrim123)
• Add --skip-install option to bundle add command to add gems to the Gemfile without installation (#6511, @agrim123)
• Add --only-explicit option to bundle outdated to list only outdated gems in the Gemfile (#5366, @peret)
• Support adding multiple gems to the Gemfile with bundle add (#6543, @agrim123)
• Make registered plugin events easier to manage in the Plugin API (@jules2689)
• Add new gem install hooks to the Plugin API (@jules2689)
• Add --optimistic and --strict options to bundle add (#6553, @agrim123)
• Add --without-group and --only-group options to bundle list (#6564, @agrim123)
• Add --gemfile option to the bundle exec command (#5924, @ankitkataria)

The following new features are available but are not enabled by default. These are intended to be tested by users for the upcoming release of Bundler 2.

• Make install --path relative to the current working directory (#2048, @igorbozato)
• Auto-configure job count (#5808, @segiddins)
• Use the Gem Version Promoter for major gem updates (#5993, @segiddins)
• Add config option to add the Ruby scope to bundle config path when configured globally (@segiddins)
• Improve deprecation warning message for bundle show command
• Improve deprecation warning message for the --force option in bundle install