Fix documentation link in pyproject.toml

Author: drammock

pyproject.toml

@@ -43,7 +43,7 @@ requires-python = ">= 3.7"
 
 [project.urls]
 "Bug Tracker" = "https://github.com/mne-tools/curry-python-reader/issues/"
-Documentation = "https://github.com/mne-tools/curry-python-reader/README.md"
+Documentation = "https://github.com/mne-tools/curry-python-reader/blob/main/README.md"
 Download = "https://pypi.org/project/curryreader/#files"
 Forum = "https://mne.discourse.group/"
 "Source Code" = "https://github.com/mne-tools/curry-python-reader/"