MAINT update license information

Author: mfeurer

setup.py

@@ -43,7 +43,7 @@
                  maintainer="Matthias Feurer",
                  maintainer_email="feurerm@informatik.uni-freiburg.de",
                  description="Python API for OpenML",
-                 license="GPLv3",
+                 license="BSD 3-clause",
                  url="http://openml.org/",
                  version=version,
                  packages=setuptools.find_packages(),
@@ -52,7 +52,7 @@
                  test_suite="nose.collector",
                  classifiers=['Intended Audience :: Science/Research',
                               'Intended Audience :: Developers',
-                              'License :: GPLv3',
+                              'License :: OSI Approved :: BSD License',
                               'Programming Language :: Python',
                               'Topic :: Software Development',
                               'Topic :: Scientific/Engineering',