we use rspec 3 now

I don't think we need to specify which version in this file.
:sweat_smile:

CONTRIBUTING.md

@@ -13,7 +13,7 @@ You should be able to run the tests now:
 bundle exec rake
 ```
 
-VCR uses [RSpec 2](http://github.com/rspec/rspec) for unit tests.  The specs are written in a very "focused" style, where each spec is concerned only with exercising the object under test, using mocks as necessary.  You can run the specs using `rake spec`.
+VCR uses [RSpec](http://github.com/rspec/rspec) for unit tests.  The specs are written in a very "focused" style, where each spec is concerned only with exercising the object under test, using mocks as necessary.  You can run the specs using `rake spec`.
 
 [Cucumber](http://cukes.info/) is used for end-to-end full stack integration tests that also function as VCR's documentation.