Use pry-rails gem instead of pry

pry-rails has pry as a dependency and this lets us have all that pry
when we run `rails console` :heart:

1 files changed, 1 insertions, 1 deletions

diff --git a/Gemfile b/Gemfile
index a0f5b70de32..e9301e59ca9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -221,7 +221,7 @@ group :development, :test do
   gem 'spinach-rails'
   gem "rspec-rails"
   gem "capybara", '~> 2.2.1'
-  gem "pry"
+  gem "pry-rails"
   gem "awesome_print"
   gem "database_cleaner"
   gem "launchy"