Remove upper limit on requests library version

setup.py

@@ -117,7 +117,7 @@ setup(name='nilmdb',
                            'python-dateutil',
                            'pytz',
                            'psutil >= 0.3.0',
-                           'requests >= 1.1.0, < 3.0.0',
+                           'requests >= 1.1.0',
                            'progressbar >= 2.2',
                            ],
       packages = [ 'nilmdb',