Change version from 0.7pre1 to 0.7a1 to satisfy distutils
diff --git a/version.py b/version.py
index 152ac1a..2eb4fae 100644
--- a/version.py
+++ b/version.py
@@ -5,4 +5,4 @@
 pyOpenSSL - A simple wrapper around the OpenSSL library
 """
 
-__version__ = '0.7pre1'
+__version__ = '0.7a1'