Add missing shebang in bash script

diff --git a/qtinterface/convert_qt_tqt1 b/qtinterface/convert_qt_tqt1
index 1b36f80..e65f144 100755
--- a/qtinterface/convert_qt_tqt1
+++ b/qtinterface/convert_qt_tqt1
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 find ./ -type f -iname "*.c*" -exec sed -i 's/\([^t]\)q1xcompatibility\.h/\1tq1xcompatibility\.h/g' {} \;
 find ./ -type f -iname "*.h*" -exec sed -i 's/\([^t]\)q1xcompatibility\.h/\1tq1xcompatibility\.h/g' {} \;
 find ./ -type f -iname "*.c*" -exec sed -i 's/\([^t]\)qabstractlayout\.h/\1tqabstractlayout\.h/g' {} \;