Update README.md

README.md

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-![unit-tests](https://github.com/yegappan/mru/workflows/unit-tests/badge.svg?branch=master) [![Coverage Status](https://codecov.io/gh/yegappan/mru/coverage.svg?branch=master)]
+![unit-tests](https://github.com/yegappan/mru/workflows/unit-tests/badge.svg?branch=master) ![Coverage Status](https://codecov.io/gh/yegappan/mru/coverage.svg?branch=master)
 
 # Most Recently Used (MRU) Vim plugin