fix dependency to bibtexparser

Under certain circumstances, when installing bibtexparser 1.0.1 release
in develop mode, it can be recognized as bibtexparser 1.0 by the
pkg_resource module, preventing pubs to execute. This is obviously very
bad.

setup.py

@@ -25,7 +25,7 @@ setup(
             ],
         },
 
-    install_requires=['pyyaml', 'bibtexparser>=1.0.1', 'python-dateutil', 'requests',
+    install_requires=['pyyaml', 'bibtexparser>=1.0', 'python-dateutil', 'requests',
                       'configobj',
                       'beautifulsoup4'],  # to be made optional?
     tests_require=['pyfakefs>=2.7'],