Update README.md

Author: ZJUFanLab

README.md

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 # Updated scCATCH 2.0
-[![R >3.6](https://img.shields.io/badge/R-%3E3.6-brightgreen.svg)](https://www.r-project.org/) <a href='#devtools'>![installed with devtools](https://img.shields.io/badge/installed%20with-devtools-blue.svg)</a> [![source package scCATCH__2.0.tar.gz](https://img.shields.io/badge/source%20package-scCATCH__2.0.tar.gz-yellowgreen.svg)](https://github.com/ZJUFanLab/scCATCH_performance_comparison/blob/master/scCATCH_2.0.tar.gz)
+[![R >3.5](https://img.shields.io/badge/R-%3E3.5-brightgreen.svg)](https://www.r-project.org/) <a href='#devtools'>![installed with devtools](https://img.shields.io/badge/installed%20with-devtools-blue.svg)</a> [![source package scCATCH__2.0.tar.gz](https://img.shields.io/badge/source%20package-scCATCH__2.0.tar.gz-yellowgreen.svg)](https://github.com/ZJUFanLab/scCATCH_performance_comparison/blob/master/scCATCH_2.0.tar.gz)
 
 ### Automatic Annotation on Cell Types of Clusters from Single-Cell RNA Sequencing Data