Update README.md

README.md

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 Numbat does not require paired DNA or genotype data and operates solely on the donor scRNA-seq data (for example, 10x Cell Ranger output). For details of the method, please checkout our paper:
 
 > [Teng Gao, Ruslan Soldatov, Hirak Sarkar, Adam Kurkiewicz, Evan Biederstedt, Po-Ru Loh, Peter Kharchenko. Haplotype-aware analysis of somatic copy number variations from single-cell transcriptomes. Nature Biotechnology (2022).](https://www.nature.com/articles/s41587-022-01468-y)
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 # User Guide
 For a complete guide, please see [Numbat User Guide](https://kharchenkolab.github.io/numbat/).