Make sure we use Python 3.5

Author: brianmay

run

@@ -1,6 +1,6 @@
 #!/bin/sh
 if python3.5 -V 2>/dev/null; then
-	exec python3 -m "sshuttle" "$@"
+	exec python3.5 -m "sshuttle" "$@"
 else
 	exec python -m "sshuttle" "$@"
 fi