Specifically request Python 3

If Sphinx is Python 3-only, Sphinx's tooling should be Python 3-only
too.

Signed-off-by: Stephen Finucane <stephen@that.guru>

1 files changed, 1 insertions, 1 deletions

diff --git a/utils/bump_version.py b/utils/bump_version.py
index 79a1fe6a7..6491a38e3 100755
--- a/utils/bump_version.py
+++ b/utils/bump_version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import argparse
 import os