Update contributors and show Ruby code in markdown

Author: ArunSahadeo

CONTRIBUTORS.md

@@ -5,3 +5,4 @@ Gathros
 Jeremie Gillet (- Jie -)
 Salim Khatib
 Hitesh C
+Arun Sahadeo

chapters/sorting_searching/bubble/bubble_sort.md

@@ -20,6 +20,8 @@ This means that we need to go through the vector $$\mathcal{O}(n^2)$$ times with
 [import, lang:"haskell"](code/haskell/bubbleSort.hs)
 {% sample lang="cpp" %}
 [import, lang:"c_cpp"](code/c++/bubblesort.cpp)
+{% sample lang="rb" %}
+[import, lang:"ruby"](code/ruby/bubble.rb)
 {% endmethod %}
 
 ... And that's it for the simplest bubble sort method.