Update README.md

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README.md

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 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.4395155.svg)](https://doi.org/10.5281/zenodo.4395155)
-[![Documentation Status](https://readthedocs.org/projects/mizuroute/badge/?version=master)](https://mizuroute.readthedocs.io/en/master/?badge=master)
+[![Documentation Status](https://readthedocs.org/projects/mizuroute/badge/?version=main)](https://mizuroute.readthedocs.io/en/latest/?badge=main)
 
 # mizuRoute
 Stand-alone mizuRoute is a post-processor of runoff output from a hydrologic model or Land surface model to produce streamflow estimates in the river network provided by a user. The tool was developed for the large scale, network based river routing (e.g., river network over contiguous United States), but works for gridded river network as well.
 
-Technical documentation is now being built on [readthedocs](https://mizuroute.readthedocs.io/en/master/)
+Technical documentation is now being built on [readthedocs](https://mizuroute.readthedocs.io/en/main/)
 
 # To get started
 1. Obtaining mizuRoute package. Just to use the tool, download the package by clicking “Download Zip” button on right column.