Remove unused gems

Gemfile

@@ -5,13 +5,10 @@ gemspec
 group :development do
   gem 'rubocop', '~> 0.43.0'
   gem 'rubocop-rspec', '~> 1.8.0'
-  gem 'coveralls', require: false
   gem 'rspec', '~> 3.0'
   gem 'rspec-mocks'
   gem 'rspec-its'
   gem 'webmock'
-  gem 'guard'
-  gem 'guard-rspec'
   gem 'pry'
   gem 'rake'
 end

Guardfile

-# A sample Guardfile
-# More info at https://github.com/guard/guard#readme
-
-guard 'rspec' do
-  watch(%r{^spec/.+_spec\.rb$})
-  watch('spec/spec_helper.rb')  { "spec" }
-  watch(%r{^lib/gitlab_git/(.+)\.rb$}) { |m| "spec/#{m[1]}_spec.rb" }
-  watch(%r{^spec/support/(.+)\.rb$})   { "spec" }
-end
-

spec/spec_helper.rb

-if ENV['TRAVIS']
-  require 'coveralls'
-  Coveralls.wear!
-else
-  require 'simplecov'
-  SimpleCov.start
-end
+require 'simplecov'
+SimpleCov.start
 require 'gitlab_git'
 require 'pry'