Add python-pipenv and ruby-rake examples

README.md

@@ -15,6 +15,12 @@ languages and build tools:
     - OpenJDK compiler
     - Maven build tool
     - JUnit test framework
+- [`python-pipenv`](https://gitlab.fi.muni.cz/unix/ci-examples/tree/python-pipenv/) (Python)
+    - Pipenv build tool
+    - pytest test framework
+- [`ruby-rake`](https://gitlab.fi.muni.cz/unix/ci-examples/tree/ruby-rake/) (Ruby)
+    - Rake build tool
+    - RSpec tests
 
 You can help us expand these examples. Simply fork this repository,
 create a branch from the initial tag and call it `<language>-<tool>`,
@@ -28,4 +34,5 @@ git checkout -b haskell-cabal
 ```
 
 Then prepare and test your `.gitlab-ci.yml` configuration with some simple
-library. When finished, create a merge request.
+library. When finished, let us know you want to add a new branch.
+After we confirm its creation, you can submit a merge request.