🔧 MAINTAIN: Add maintainer metadata (#11)

Author: hukkin

pyproject.toml

@@ -5,8 +5,9 @@ build-backend = "flit_core.buildapi"
 
 [tool.flit.metadata]
 module = "mdformat_myst"
-author = "Taneli Hukkinen" 
-author-email = "executablebooks@gmail.com"
+author = "Taneli Hukkinen"
+maintainer = "Executable Book Project" 
+maintainer-email = "executablebooks@gmail.com"
 description-file = "README.md"
 home-page = "https://github.com/hukkinj1/mdformat-myst"
 license = "MIT"