bpo-33985: Implement ContextVar.name attribute. (GH-7980)

diff --git a/Doc/library/contextvars.rst b/Doc/library/contextvars.rst
index 9c7ea2b..8805661 100644
--- a/Doc/library/contextvars.rst
+++ b/Doc/library/contextvars.rst
@@ -48,6 +48,8 @@
 
       The name of the variable.  This is a read-only property.
 
+      .. versionadded:: 3.7.1
+
    .. method:: get([default])
 
       Return a value for the context variable for the current context.