update the default rake task

README.md

@@ -76,7 +76,18 @@ https://github.com/airbrake/airbrake/wiki
 Development
 -----------
 
-Use `bundle && rake` to run the tests.
+We use [Appraisals](https://github.com/thoughtbot/appraisal) to run the tests.
+
+To run the test suite on your machine, you need to run the following commands:
+
+    bundle
+    bundle exec rake appraisal:install
+
+After this, you're ready to run the suite with:
+
+    bundle exec rake
+
+This will include cucumber features we use to fully test the integration.
 
 Credits
 -------

Rakefile

@@ -13,8 +13,10 @@ end
 require './lib/airbrake/version'
 
 task :default do
-  exec 'rake appraisal test'
-  exec 'rake appraisal cucumber'
+  exec 'rake appraisal:rails-3.0 test '\
+  '&& rake appraisal:rails-3.1 test '\
+  '&& rake appraisal:rails-3.2 test '\
+  '&& rake appraisal cucumber'\
 end
 
 desc 'Test the airbrake gem.'

airbrake.gemspec

@@ -28,7 +28,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency("aruba")
   s.add_development_dependency("appraisal")
   s.add_development_dependency("rspec-rails")
-  s.add_development_dependency("sinatra")
   s.add_development_dependency("girl_friday")
   s.add_development_dependency("json-schema")