Merge pull request #71 from COSIMA/ncc/codecov-badge

Update codecov badge to point to `main` branch

README.md

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 *Python package for automatic generation of regional configurations for the [Modular Ocean Model 6](https://github.com/mom-ocean/MOM6).*
 
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 Users just need to provide some information about where, when, and how big their domain is and also where raw input forcing files are. The package sorts out all the boring details and creates a set of MOM6-friendly input files along with setup directories ready to go!