updated changelog, resolve pytest-dev#1539

CHANGELOG.rst

@@ -146,7 +146,8 @@ time or change existing behaviors in order to make them less surprising/more use
   Thanks to `@anntzer`_ for the PR.
 
 
-*
+* Better message in case of not using parametrized variable (see `#1539`_).
+  Thanks to `@tramwaj29`_ for the PR.
 
 *
 
@@ -314,6 +315,7 @@ time or change existing behaviors in order to make them less surprising/more use
 .. _#1664: https://github.com/pytest-dev/pytest/pull/1664
 .. _#1684: https://github.com/pytest-dev/pytest/pull/1684
 .. _#1723: https://github.com/pytest-dev/pytest/pull/1723
+.. _#1539: https://github.com/pytest-dev/pytest/issues/1539
 
 .. _@DRMacIver: https://github.com/DRMacIver
 .. _@RedBeardCode: https://github.com/RedBeardCode
@@ -345,6 +347,7 @@ time or change existing behaviors in order to make them less surprising/more use
 .. _@tareqalayan: https://github.com/tareqalayan
 .. _@taschini: https://github.com/taschini
 .. _@txomon: https://github.com/txomon
+.. _@tramwaj29: https://github.com/tramwaj29
 
 2.9.2
 =====