Remove Coveralls

Coveralls is fine, but it's interfering with Travis somehow.

Gemfile

@@ -8,11 +8,6 @@ platforms :ruby do
   gem 'sqlite3', '1.3.8'
 end
 
-platforms :mri do
-  gem 'coveralls', require: false
-  gem 'simplecov', require: false
-end
-
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter'
 end

README.md

@@ -1,6 +1,5 @@
 [![Build Status](https://api.travis-ci.org/rails-api/active_model_serializers.png)](https://travis-ci.org/rails-api/active_model_serializers) 
 [![Code Climate](https://codeclimate.com/github/rails-api/active_model_serializers.png)](https://codeclimate.com/github/rails-api/active_model_serializers) 
-[![Coverage Status](https://coveralls.io/repos/rails-api/active_model_serializers/badge.png?branch=master)](https://coveralls.io/r/rails-api/active_model_serializers)
 
 # ActiveModel::Serializers
 

test/coverage_setup.rb

@@ -1,15 +0,0 @@
-begin
-  require 'simplecov'
-  require 'coveralls'
-
-  SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
-    SimpleCov::Formatter::HTMLFormatter,
-    Coveralls::SimpleCov::Formatter
-  ]
-
-  SimpleCov.start do
-    add_group "lib", "lib"
-    add_group "test", "test"
-  end
-rescue LoadError
-end

test/test_helper.rb

@@ -1,5 +1,4 @@
 require 'bundler/setup'
-require 'coverage_setup' if ENV["CI"]
 require 'minitest/autorun'
 require 'active_model_serializers'
 require 'fixtures/poro'