Correct the typo on the license section

Author: varlackc

recipe/meta.yaml

@@ -42,7 +42,7 @@ test:
 about:
   home: https://github.com/pybind/pybind11/
   license: BSD-3-Clause
-  license: license_family: BSD
+  license_family: BSD
   summary: Seamless operability between C++11 and Python
   license_file: LICENSE
   doc_url: https://github.com/pybind/pybind11/blob/master/README.rst