Bump version to 3.4.0 alpha 0.
diff --git a/configure.ac b/configure.ac
index e3f5b96..df0b004 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@
 dnl ***********************************************
 
 # Set VERSION so we only need to edit in one place (i.e., here)
-m4_define(PYTHON_VERSION, 3.3)
+m4_define(PYTHON_VERSION, 3.4)
 
 AC_PREREQ(2.65)