Rakefile in chartkick-1.3.2 vs Rakefile in chartkick-1.4.0

@@ -1,8 +1,8 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
 
-task :default => :test
+task default: :test
 Rake::TestTask.new do |t|
   t.libs << "test"
   t.pattern = "test/**/*_test.rb"
 end