Update docs and patchlevel for 3.6.0 final.

Author: ned-deily

Doc/whatsnew/3.6.rst

@@ -47,6 +47,9 @@
    when researching a change.
 
 This article explains the new features in Python 3.6, compared to 3.5.
+Python 3.6 was released on December 23, 2016.  See the
+`changelog <https://docs.python.org/3.6/whatsnew/changelog.html>`_ for a full
+list of changes.
 
 .. seealso::
 

Include/patchlevel.h

@@ -19,11 +19,11 @@
 #define PY_MAJOR_VERSION	3
 #define PY_MINOR_VERSION	6
 #define PY_MICRO_VERSION	0
-#define PY_RELEASE_LEVEL	PY_RELEASE_LEVEL_GAMMA
-#define PY_RELEASE_SERIAL	2
+#define PY_RELEASE_LEVEL	PY_RELEASE_LEVEL_FINAL
+#define PY_RELEASE_SERIAL	0
 
 /* Version as a string */
-#define PY_VERSION      	"3.6.0rc2"
+#define PY_VERSION      	"3.6.0"
 /*--end constants--*/
 
 /* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.