Update README.md

README.md

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 ## Dataset Summary
 
 This dataset contains all posts submitted to StackOverflow before the 14th of June 2023 formatted as **Markdown text**.<br>
-The dataset contains over 60 Million posts, totaling ~40GB in size and ~65 billion characters of text.<br>
+The dataset contains ~60 Million posts, totaling ~35GB in size and ~65 billion characters of text.<br>
 The data is sourced from [Internet Archive StackExchange Data Dump](https://archive.org/download/stackexchange).
 
 ## Dataset Structure