[ruby-cvs:73439] hsbt:r66338 (trunk): Merge Bundler 1.17.2 from upstream.

[hsbt at ruby-lang.org]

hsbt	2018-12-11 20:02:41 +0900 (Tue, 11 Dec 2018)

  New Revision: 66338

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66338

  Log:
    Merge Bundler 1.17.2 from upstream.

  Modified files:
    trunk/lib/bundler/dsl.rb
    trunk/lib/bundler/feature_flag.rb
    trunk/lib/bundler/version.rb
    trunk/spec/bundler/bundler/dsl_spec.rb