Updated CHANGES.txt

Author: fblundun

CHANGES.txt

@@ -8,7 +8,7 @@ Removed the "URL from Cloudfront subdomain" option (#56)
 Started sending event vendor parameter through on querystring (#55)
 Changed track screen view to use an unstructured event (#53)
 Added ability to name individual instances of the Python Tracker (#52)
-Validated GET payload in all integration tests (#33) (TODO)
+Validated GET payload in all integration tests (#33)
 Added support for Python 2.7 (#42)
 Fixed versions in requirements.txt (#47)
 Added platform and tracker version to payload (#50)