Changed input handler shebang lines to use explicit python2 instead of python. Cant switch to python3 because of msodump anyway

src/filters/rclepub1

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 """Extract Html content from an EPUB file (.chm), concatenating all sections"""
 from __future__ import print_function