Update CodeClimate test reporter

.simplecov

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
-SimpleCov.start do
-  add_filter '/spec/'
-  add_group 'Lib', 'lib/'
-  formatter SimpleCov::Formatter::HTMLFormatter unless ENV['TRAVIS']
+unless defined?(RUBY_ENGINE) && %w(rbx jruby).include?(RUBY_ENGINE)
+  SimpleCov.start do
+    add_filter '/spec/'
+    formatter SimpleCov::Formatter::HTMLFormatter unless ENV['TRAVIS']
+  end
 end

.travis.yml

@@ -1,14 +1,20 @@
-dist: trusty
-sudo: required
+dist: xenial
+sudo: false
 language: ruby
 rvm:
-# The latest ruby that is pre-installed on Travis Trusty
-- 2.3.1
+- 2.3.8
 env:
   global:
   - TRAVIS=1 CI=1 COVERAGE=1
 cache: bundler
 bundler_args: --without debug
 
-# Avoid rake here, as the RSpec test task spawns a new process which does not run via bundler.
-script: "bundle exec rspec --format d && bundle exec rubocop && bundle exec codeclimate-test-reporter"
+before_script:
+- curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+- chmod +x ./cc-test-reporter
+- ./cc-test-reporter before-build
+script:
+- bundle exec rspec --format d
+- bundle exec rubocop
+after_script:
+- ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT

Gemfile

@@ -6,10 +6,3 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'thredded', '>= 0.8.0', '< 1.0', git: 'https://github.com/thredded/thredded'
-
-if ENV['CI']
-  group :test do
-    # CodeClimate coverage reporting.
-    gem 'codeclimate-test-reporter', require: false
-  end
-end