update dataset.xlsx url

Author: RomanBoegli

README.md

@@ -1,6 +1,6 @@
 > *This artifact extends the open-source tlparser tool [^tlparser] by adding capabilities for the automatic analysis of natural-language specifications and for supporting their quality evaluation. The codebase was obtained by cloning the upstream repository and augmenting it with these features.*
 
-- Direct link to Edge/IoT dataset: [Dataset.xlsx](./data/Edge_IoT/Dataset.xlsx)
+- Direct link to Edge/IoT dataset: [Dataset.xlsx](https://github.com/SEG-UNIBE/tlparser/raw/refs/heads/extension/data/Edge_IoT/Dataset.xlsx)
 
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