Bump version number to 3.4.0b1.
diff --git a/Lib/idlelib/idlever.py b/Lib/idlelib/idlever.py
index fed9779..cd2c8bf 100644
--- a/Lib/idlelib/idlever.py
+++ b/Lib/idlelib/idlever.py
@@ -1 +1 @@
-IDLE_VERSION = "3.4.0a4"
+IDLE_VERSION = "3.4.0b1"