2015-06-23: prepare NEWS file for release.

prepare NEWS file for release.

diff --git a/NEWS b/NEWS
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+wisp 0.8.4 (2015-06-23):
+- no longer wrap wisp blocks into begin. Fixes missing macro
+  definitions when executed as file.
+- any top-level form ends a wisp block. Required to avoid wrapping in
+  begin. In the REPL code is now executed when entering the first line
+  of the next top-level form.
+- new examples: newbase60 and cli.
+- known issue: To execute a procedure with shell-indirection, you have
+  to define a module.
+- wisp-mode: disable electric-indent-mode which reindented lines
+  wrongly when pressing enter.
+
 wisp 0.8.3 (2015-04-10):
 - add partial source-properties support: show line numbers in backtraces.
 - d20world: start of experiement to plot the results.