Adapt setup

Author: SabineHaas

setup.py

@@ -19,7 +19,7 @@ def read(fname):
                            os.path.join('oedb', '*.csv')]},
       long_description=read('README.rst'),
       zip_safe=False,
-      install_requires=['pandas >= 0.19.1, < 0.25',
+      install_requires=['pandas >= 0.20.0, < 0.26',
                         'requests < 3.0'],
       extras_require={
           'dev': ['pytest', 'jupyter', 'sphinx_rtd_theme', 'nbformat',