use bundlers rake tasks

Gemfile

@@ -13,5 +13,4 @@ gem "salama-reader" , :path => "."
 group :development do
   gem "codeclimate-test-reporter", require: nil
   gem "minitest"
-  gem "rubygems-tasks"
 end

Gemfile.lock

@@ -24,7 +24,6 @@ GEM
     parslet (1.7.1)
       blankslate (>= 2.0, <= 4.0)
     rake (10.4.2)
-    rubygems-tasks (0.2.4)
     simplecov (0.9.2)
       docile (~> 1.1.0)
       multi_json (~> 1.0)
@@ -39,7 +38,6 @@ DEPENDENCIES
   codeclimate-test-reporter
   minitest
   rake
-  rubygems-tasks
   salama-reader!
 
 BUNDLED WITH

Rakefile

@@ -11,9 +11,7 @@ rescue Bundler::BundlerError => e
 end
 require 'rake'
 
-
+require "bundler/gem_tasks"
-require 'rubygems/tasks'
-Gem::Tasks.new
 
 require 'rake/testtask'
 Rake::TestTask.new(:test) do |test|