Add Python 2 plans to readme

Author: altendky

README.rst

@@ -17,6 +17,19 @@ pytest-twisted is a plugin for pytest, which allows to test code,
 which uses the twisted framework. test functions can return Deferred
 objects and pytest will wait for their completion with this plugin.
 
+
+Python 2 Plans
+==================
+
+At some point it may become impractical to retain Python 2 support.
+Given the small size and very low amount of development it seems
+likely that this will not be a near term issue.  While I personally
+have no need for Python 2 support I try to err on the side of being
+helpful so support will not be explicitly removed.  If issues are
+reported and neither myself nor the community have time to resolve
+them then options will have to be considered.
+
+
 Installation
 ==================
 Install the plugin with::