bump version to 2.7b1
diff --git a/Lib/idlelib/idlever.py b/Lib/idlelib/idlever.py
index 2343ea8..a78d4ec 100644
--- a/Lib/idlelib/idlever.py
+++ b/Lib/idlelib/idlever.py
@@ -1 +1 @@
-IDLE_VERSION = "2.7a4"
+IDLE_VERSION = "2.7b1"