Update minitest

Author: ofedoren

Gemfile

@@ -4,7 +4,7 @@ gemspec
 
 group :test do
   gem 'rake'
-  gem 'minitest', '5.18'
+  gem 'minitest', '~> 5.18'
   gem 'minitest-spec-context'
   gem 'mocha', '~> 1.11.0'
   gem 'simplecov'

test/test_helper.rb

@@ -2,7 +2,7 @@
 FOREMAN_OPENSCAP_VERSION = Gem::Version.new(ENV['TEST_API_VERSION'])
 
 require 'minitest/autorun'
-require 'minitest/spec'
+require 'minitest/unit'
 require "minitest-spec-context"
 require "mocha/minitest"
 require 'hammer_cli'