Prepare for 2.5.5c1.
diff --git a/Lib/idlelib/idlever.py b/Lib/idlelib/idlever.py
index 385327d..901c812 100644
--- a/Lib/idlelib/idlever.py
+++ b/Lib/idlelib/idlever.py
@@ -1 +1 @@
-IDLE_VERSION = "1.2.4"
+IDLE_VERSION = "1.2.5c1"