links at "Learn More" are broken ("RSpec::Expectations" and "RSpec::Matchers") ;)
Bummer. Those links are there because they work on http://rubydoc.info/gems/rspec-expectations/file/README.md. Unfortunately they can't work there and on github, so I guess I'll just remove them to avoid confusion. Kinda sucks, but there it is.
Remove relative links from README, since they can't work correctly on
github and rubydoc.info.
- Fixes #113.