2014-09-02: update news for release 0.6.4

update news for release 0.6.4

diff --git a/NEWS b/NEWS
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+wisp 0.6.4 (2014-09-02):
+- an actually working wisp implementation for scheme (only) which uses the guile reader. This should be actually correct for scheme. And match-magic ☺
+- polishing.
+
 wisp 0.6.1 (2014-08-05):
 - simpler unicode handling
 - honor --quiet in bootstrapping