[gupnp] binding-tool: Make shebang python3

[Jens Georg <jensgeorg src gnome org>]

commit 74748ffb70f4c3112fc06187d25a9df192d72b0d
Author: Jens Georg <mail jensge org>
Date:   Wed Dec 26 07:44:47 2018 +0100

    binding-tool: Make shebang python3
    
    Fixes #1

 tools/gupnp-binding-tool-1.2 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/gupnp-binding-tool-1.2 b/tools/gupnp-binding-tool-1.2
index b9275f2..6feb898 100755
--- a/tools/gupnp-binding-tool-1.2
+++ b/tools/gupnp-binding-tool-1.2
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
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