Bump version to 1.6a2 -- to be released one of these days.

Include/patchlevel.h

@@ -53,13 +53,13 @@ PERFORMANCE OF THIS SOFTWARE.
 #define PY_MINOR_VERSION	6
 #define PY_MICRO_VERSION	0
 #define PY_RELEASE_LEVEL	PY_RELEASE_LEVEL_ALPHA
-#define PY_RELEASE_SERIAL	1
+#define PY_RELEASE_SERIAL	2
 
 /* Version as a string */
-#define PY_VERSION		"1.6a1"
+#define PY_VERSION		"1.6a2"
 
 /* Historic */
-#define PATCHLEVEL		"1.6a1"
+#define PATCHLEVEL		"1.6a2"
 
 /* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.
    Use this for numeric comparisons, e.g. #if PY_VERSION_HEX >= ... */