Update CHANGES/CONTRIBUTORS.

Author: dkasak

CHANGES.md

@@ -3,6 +3,7 @@
 ## python-markdown2 2.4.0 (not yet released)
 
 - [pull #377] Fixed bug breaking strings elements in metadata lists
+- [pull #380] When rendering fenced code blocks, also add the `language-LANG` class
 
 
 ## python-markdown2 2.3.10

CONTRIBUTORS.txt

@@ -47,3 +47,4 @@ Gareth Simpson (github.com/xurble)
 Kat Hagan (github.com/codebykat)
 Stɑrry Shivɑm (github.com/starry69)
 André Nasturas (github.com/andrenasturas)
+Denis Kasak (github.com/dkasak)