[#26] Explicitly specify rubocop config for Travis CI

.rubocop.yml

@@ -1,6 +1,8 @@
 AllCops:
   Include:
     - Rakefile
+  Exclude:
+    - bin/**/*
 
 Layout/DotPosition:
   EnforcedStyle: leading

.travis.yml

@@ -5,4 +5,5 @@ rvm:
   - 2.4.0
   - 2.4.1
 script:
-  - bundle exec rake
+  - bin/rake test
+  - bin/rubocop -c rubocop.yml

bin/rake

@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+#
+# This file was generated by Bundler.
+#
+# The application 'rake' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rake", "rake")

bin/rubocop

@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+#
+# This file was generated by Bundler.
+#
+# The application 'rubocop' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rubocop", "rubocop")