Fix sncosmo description
Fix sncosmo description

astropy/conda-build-tools,cdeil/conda-builder-affiliated,zblz/conda-builder-affiliated,Cadair/conda-builder-affiliated,bmorris3/conda-builder-affiliated,astropy/conda-builder-affiliated,mwcraig/conda-builder-affiliated,Cadair/conda-builder-affiliated,kbarbary/conda-builder-affiliated,zblz/conda-builder-affiliated,kbarbary/conda-builder-affiliated,bmorris3/conda-builder-affiliated,mwcraig/conda-builder-affiliated,astropy/conda-build-tools,astropy/conda-builder-affiliated,cdeil/conda-builder-affiliated