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.

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.

• Improve deprecation warning message for bundle show command
• Improve deprecation warning message for the --force option in bundle install