Update rake (and rake-compiler) to suppress the warning. (#1099)

To suppress the warning:
/home/travis/.rvm/gems/ruby-head/gems/rake-10.4.2/lib/rake/application.rb:381: warning: deprecated Object#=~ is called on Proc; it always returns nil
in the process of "bundle exec rake compile".

Author: junaruga

Gemfile

@@ -2,8 +2,12 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'rake', '~> 10.4.2'
-gem 'rake-compiler', '~> 1.0'
+gem 'rake', if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("2.2")
+              '~> 13.0.1'
+            else
+              '< 13'
+            end
+gem 'rake-compiler', '~> 1.1.0'
 
 group :test do
   gem 'eventmachine' unless RUBY_PLATFORM =~ /mswin|mingw/