fix dead link in meta.yaml
Closes
@@ -62,7 +62,7 @@ about:
license_family: MIT
# It is strongly encouraged to include a license file in the package,
# (even if the license doesn't require it) using the license_file entry.
- # See https://conda.pydata.org/docs/building/meta-yaml.html#license-file
+ # See https://docs.conda.io/projects/conda-build/en/latest/resources/define-metadata.html#license-file
license_file: LICENSE.txt
summary: 'Simple, fast, extensible JSON encoder/decoder for Python'
