Updated changelog to specify changes in 2.1.0

Author: IanLee1521

CHANGES.txt

@@ -1,6 +1,13 @@
 Changelog
 =========
 
+2.1.0 (unreleased)
+------------------
+
+Changes:
+
+* Added check E74x for using variables named 'l', 'O', or 'I'; #341
+
 
 2.0.0 (2016-05-31)
 ------------------
@@ -16,7 +23,6 @@ Changes:
 * Added check E275 for whitespace on `from ... import ...` lines; #489 / #491
 * Added W503 to the list of codes ignored by default ignore list; #498
 * Removed use of project level `.pep8` configuration file; #364
-* Added check E741 for using variables named 'l', 'O', or 'I'; #341
 
 Bugs: