fixed typo and black formatted

Author: hrshdhgd

pyproject.toml

@@ -3,7 +3,7 @@ name = "linkml-transformer"
 version = "0.1.0"
 description = ""
 authors = ["cmungall <[email protected]>"]
-long_description = "README.md"
+readme = "README.md"
 
 [tool.poetry.dependencies]
 python = "^3.8"