Use correct hash syntax

gdiggs · gdiggs · commit c41baeddcf5b · 2016-03-23T12:02:38.000-04:00
diff --git a/Rakefile b/Rakefile
@@ -3,4 +3,4 @@ require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :spec
+task default: :spec
