fix version and rubygem version

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/branches/0.5.x@1002285 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/configure.ac b/configure.ac
index 28c2123..e218517 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@
 
 AC_PREREQ(2.65)
 
-AC_INIT([thrift], [0.5.0-dev])
+AC_INIT([thrift], [0.5.0])
 
 AC_CONFIG_AUX_DIR([.])