Remove delete_index_if_exists method (#278)

Author: curquiza

lib/meilisearch/client.rb

@@ -36,17 +36,6 @@ def delete_index(index_uid)
       index_object(index_uid).delete
     end
 
-    # # Usage:
-    # # client.delete_index_if_exists('indexUID')
-    # def delete_index_if_exists(index_uid)
-    #   index_object(index_uid).delete
-    #   true
-    # rescue ApiError => e
-    #   raise e if e.code != 'index_not_found'
-
-    #   false
-    # end
-
     # Usage:
     # client.index('indexUID')
     def index(index_uid)