Update README.md

Source: dekoder.org (2023): The President’s Words: A Term Frequency Analysis of Putin’s and Medvedev’s Statements in Official Kremlin Transcripts, v. 1.1, Discuss Data, https://doi.org/10.48320/7E016752-2438-46C9-9526-D35D41C823A2

README.md

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-license: odc-by
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+license: odc-by
+language:
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