Update pyproject.toml

Author: bbr111

pyproject.toml

@@ -11,7 +11,7 @@ requires-python = ">=3.9"
 name = "bydhvs"
 dynamic = ["version"]
 description = "A module for communicating with the BYD HVS Battery system"
-readme = { file = "README.md", content-type = "txt/markdown" }
+readme = { file = "README.md", content-type = "text/markdown" }
 license = { text = "GPL-3.0" }
 authors = [
   {name = "bbr111", email = "[email protected]"}