Update README.md

Co-authored-by: Filipe <[email protected]>

README.md

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-# ioos_metrics
+# ioos-metrics
 
 A library to compute and compile metrics about the U.S. Integrated Ocean Observing System (U.S. IOOS®). U.S. IOOS® is a vital tool for tracking, predicting, managing, and adapting to changes in our ocean, coastal and Great Lakes environment.