Fix instructions

Allows anyone to clone the repo by using the recommended https endpoint

Author: pboling

README.md

@@ -5,12 +5,12 @@ This is the sample application for
 by [Michael Hartl](http://michaelhartl.com/). You can use this reference implementation to help track down errors if you end up having trouble with code in the tutorial. In particular, as a first debugging check I suggest getting the test suite to pass on your local machine:
 
     $ cd /tmp
-    $ git clone git@github.com:railstutorial/sample_app_rails_4.git
+    $ git clone https://github.com/railstutorial/sample_app_rails_4.git
     $ cd sample_app_rails_4
     $ cp config/database.yml.example config/database.yml
     $ bundle install
     $ bundle exec rake db:migrate
     $ bundle exec rake db:test:prepare
     $ bundle exec rspec spec/
 
-If the tests don't pass, it means there may be something wrong with your system. If they do pass, then you can debug your code by comparing it with the reference implementation.
+If the tests don't pass, it means there may be something wrong with your system. If they do pass, then you can debug your code by comparing it with the reference implementation.