Update downloads to 700 million times

ruby/testing_ruby_with_rspec/introduction_to_rspec.md

@@ -1,6 +1,6 @@
 ### Introduction
 
-In the previous lesson, we established the utility of [test-driven development](https://en.wikipedia.org/wiki/Test-driven_development) (TDD) in maintaining your code and sanity. In this lesson, we'll introduce you to your new best friend, the [RSpec](http://rspec.info/) testing framework. It's one of the most popular testing frameworks, having been downloaded more than [480 million times](https://rubygems.org/gems/rspec), at the time of this writing, and having been ported for use in [Rails testing](https://rubygems.org/gems/rspec-rails).
+In the previous lesson, we established the utility of [test-driven development](https://en.wikipedia.org/wiki/Test-driven_development) (TDD) in maintaining your code and sanity. In this lesson, we'll introduce you to your new best friend, the [RSpec](http://rspec.info/) testing framework. It's one of the most popular testing frameworks, having been downloaded more than [700 million times](https://rubygems.org/gems/rspec), at the time of this writing, and having been ported for use in [Rails testing](https://rubygems.org/gems/rspec-rails).
 
 ### Learning outcomes