Remove Codecov for now

It's broken on CI due to missing API Keys. If we want to bring this
back, fine, but whoever does can be sure to set up the necessary keys
and services.

Gemfile

@@ -7,10 +7,6 @@ source 'http://rubygems.org'
 # development dependencies will be added by default to the :development group.
 gemspec
 
-group :test do
-  gem 'codecov', require: false
-end
-
 gem 'rails', '~> 6.1'
 gem 'rspec-rails', '~> 5.0'
 gem 'rubocop', '~> 1.22'

spec/spec_helper.rb

@@ -1,13 +1,5 @@
 # frozen_string_literal: true
 
-require 'simplecov'
-SimpleCov.start
-
-if ENV.fetch('CI', '') == 'true'
-  require 'codecov'
-  SimpleCov.formatter = SimpleCov::Formatter::Codecov
-end
-
 require 'shoulda-matchers'
 
 RSpec.configure do |config|