Add Changelog for #147

Author: mynetx

CHANGELOG

@@ -16,6 +16,7 @@ codebird-php - changelog
 + Support WebP media format
 + Fixes for non-multipart media uploads, see #141
 + Return rate-limiting info as object, when return format = object
+- #147 Undefined index when checking for possible media files
 
 2.7.2 (2015-09-23)
 - #135 Invalid HTTP request headers in non-cURL mode