Fix typo in pyproject.toml (#197)

Signed-off-by: Max Chesterfield <max.chesterfield@zepben.com>

Author: chestm007

pyproject.toml

@@ -15,7 +15,7 @@
     name = "zepben.ewb"
     version = "1.0.0b6"
     description = "Python SDK for interacting with the Energy Workbench platform"
-    readme = {file = "README.md", content-type = "test/markdown"}
+    readme = {file = "README.md", content-type = "text/markdown"}
     license = "MPL-2.0"
     requires-python = '>=3.9,<3.13'
     authors = [