Merge pull request #14 from j-b-d/specify-yaml-loader

Includes fix wherein `yaml.load` requires `Loader` keyword argument.

Ref.: yaml/pyyaml#576 (looks like it's intended and won't be fixed)

third_party_license_file_generator/__main__.py

@@ -131,7 +131,7 @@
     license_overrides = {}
     if args.license_override_file is not None:
         with codecs.open(args.license_override_file, "r", "utf-8") as f:
-            license_overrides = yaml.load(f.read())
+            license_overrides = yaml.load(f.read(), Loader=yaml.SafeLoader)
 
         for module_name, license_override in license_overrides.items():
             license_name = license_override.get("license_name")