Add GITHUB Issue details in Changes.txt

Author: krmahadevan

CHANGES.txt

@@ -1,6 +1,6 @@
 Current
 New: GITHUB-2897: Not exception but warning if some (not all) of the given test names are not found in suite files. (Bruce Wen)
-New: Added assertListContains and assertListContainsObject methods to check if specific object present in List (Dmytro Budym)
+New: GITHUB-2907: Added assertListContains and assertListContainsObject methods to check if specific object present in List (Dmytro Budym)
 Fixed: GITHUB-2888: Skipped Tests with DataProvider appear as failed (Joaquin Moreira)
 Fixed: GITHUB-2884: Discrepancies with DataProvider and Retry of failed tests (Krishnan Mahadevan)
 Fixed: GITHUB-2879: Test listeners specified in parent testng.xml file are not included in testng-failed.xml file (Krishnan Mahadevan)