fix setup.cfg

Author: cyouri-csgroup

setup.cfg

@@ -31,7 +31,7 @@ long_description = file:README.md
 long_description_content_type = text/markdown
 license_files = LICENSE
 platform = any
-keywords: slurp, LULC, mask, segmentation, classification
+keywords = slurp, LULC, mask, segmentation, classification
 classifiers =
     Development Status :: 4 - Beta
     Intended Audience :: Developers