Merge branch 'fix-80'

Author: aerkalov

ebooklib/epub.py

@@ -872,6 +872,8 @@ def _write_opf_file(self):
             if ns_name == NAMESPACES['OPF']:
                 for values in values.values():
                     for v in values:
+                        if 'property' in v[1] and v[1]['property'] == "dcterms:modified":
+                            continue
                         try:
                             el = etree.SubElement(metadata, 'meta', v[1])
                             if v[0]: