Merge pull request #411 from SzilviH/replace-gitter-link-2

Replace gitter link with slack

Author: KimberleyCook

ruby/lesson2/tutorial.md

@@ -238,7 +238,7 @@ rake regen
 
 To try out the koans run `rake`. It gives you a hint as to what fails and you can move forward by fixing the file and running `rake` again.
 
-If you are working through this at home you can ask for help in our [gitter channel](https://gitter.im/codebar/tutorials).
+If you are working through this at home you can ask for help in our [slack channel](https://slack.codebar.io/).
 
 ## Some reading material
 

ruby/lesson3/tutorial.md

@@ -90,7 +90,7 @@ If you haven't started going through Ruby Koans yet, you can find more informati
 
 ## More practise
 
-There are a lot of online interactive tutorials that you can work through. Understanding basic concepts its important before moving forward. Try practising what you've learned so far by coming up and applying your own ideas. If you get stuck or needs help, bring your questions with you to our next session or ask your questions on our [gitter chat](gitter.im/codebar/tutorials)
+There are a lot of online interactive tutorials that you can work through. Understanding basic concepts its important before moving forward. Try practising what you've learned so far by coming up and applying your own ideas. If you get stuck or needs help, bring your questions with you to our next session or ask your questions on our [slack channel](https://slack.codebar.io/)
 
 ---
 This ends our **Ruby basics (part 2)** tutorial. Is there something you don't understand? Try and go through the provided resources with your coach. If you have any feedback, or can think of ways to improve this tutorial [send us an email](mailto:[email protected]) and let us know.

ruby/lesson4/tutorial.md

@@ -9,7 +9,7 @@ There are no sample files for this tutorial as you should already know how to cr
 
 Don't forget to commit to git regularly and also try to **type** out the examples as much as possible instead of copy & pasting!
 
-If you are going through the tutorial in your own time and need any help then [join the chatroom](https://gitter.im/codebar/tutorials), but first read our [Code of Conduct](http://codebar.io/code-of-conduct) as we will not tolerate any inappropriate behavior.
+If you are going through the tutorial in your own time and need any help then [join our slack channel](https://slack.codebar.io/), but first read our [Code of Conduct](http://codebar.io/code-of-conduct) as we will not tolerate any inappropriate behavior.
 
 # What is Object Oriented Programming?
 

ruby/lesson5/tutorial.md

@@ -7,7 +7,7 @@ In today's tutorial, we will be again going through OO concepts - some of which
 
 Don't forget to commit to git regularly and also try to **type** out the examples as much as possible instead of copy & pasting!
 
-If you are going through the tutorial in your own time and need any help then [join the chatroom](https://gitter.im/codebar/tutorials), but first read our [Code of Conduct](http://codebar.io/code-of-conduct) as we will not tolerate any inappropriate behavior.
+If you are going through the tutorial in your own time and need any help then [join the slack channel](https://slack.codebar.io/), but first read our [Code of Conduct](http://codebar.io/code-of-conduct) as we will not tolerate any inappropriate behavior.
 
 # How does inheritance fit in OO?