Merge pull request #877 from mbj/remove/rspec-3.7-support

Remove rspec 3.7 support

Author: mbj

mutant-rspec.gemspec

@@ -17,5 +17,5 @@ Gem::Specification.new do |gem|
   gem.extra_rdoc_files = %w[LICENSE]
 
   gem.add_runtime_dependency('mutant', "~> #{gem.version}")
-  gem.add_runtime_dependency('rspec-core', '>= 3.7.0', '< 4.0.0')
+  gem.add_runtime_dependency('rspec-core', '>= 3.8.0', '< 4.0.0')
 end

spec/integration/mutant/rspec_spec.rb

@@ -5,7 +5,7 @@
     %w[bundle exec mutant -I lib --require test_app --use rspec]
   end
 
-  %w[3.7 3.8].each do |version|
+  %w[3.8].each do |version|
     context "RSpec #{version}" do
       let(:gemfile) { "Gemfile.rspec#{version}" }