Revised version identifier for PEP440 compliance.
diff --git a/serial/__init__.py b/serial/__init__.py
index 014586d..55a0a13 100644
--- a/serial/__init__.py
+++ b/serial/__init__.py
@@ -13,7 +13,7 @@
 from serial.serialutil import *
 #~ SerialBase, SerialException, to_bytes, iterbytes
 
-__version__ = '3.2.1.dev-rg1'
+__version__ = '3.2.1+rg.1'
 
 VERSION = __version__