[bundler/bundler] Remove unused filter

https://github.com/bundler/bundler/commit/102d6229d4

spec/bundler/spec_helper.rb

@@ -71,7 +71,6 @@ RSpec.configure do |config|
   config.filter_run_excluding :ruby => RequirementChecker.against(RUBY_VERSION)
   config.filter_run_excluding :rubygems => RequirementChecker.against(Gem::VERSION)
   config.filter_run_excluding :git => RequirementChecker.against(git_version)
-  config.filter_run_excluding :rubygems_master => (ENV["RGV"] != "master")
   config.filter_run_excluding :bundler => RequirementChecker.against(Bundler::VERSION.split(".")[0])
   config.filter_run_excluding :ruby_repo => !(ENV["BUNDLE_RUBY"] && ENV["BUNDLE_GEM"]).nil?
   config.filter_run_excluding :non_windows => Gem.win_platform?