Update CHANGELOG for 1.3

Author: nicoddemus

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 1.3.0
+
+- New `cpp_harness` configuration option allows users to add prefix arguments when running the C++ test runner, allowing to use tools like `valgrind`. Thanks to @dajose for contributing!
+
 # 1.2.1
 
 - Remove `from_parent()`-related warnings in pytest 5.4.2+.

README.rst

@@ -100,8 +100,10 @@ Set it to ``False`` if you have C++ executable files that end with the ``*.py``
 
 **cpp_harness**
 
+*New in version 1.3*.
+
 This option allows the usage of tools that are used by invoking them on the console
-wrapping the test binary, like valgrind and memcheck
+wrapping the test binary, like valgrind and memcheck:
 
 .. code-block:: ini