Update README.md

Author: tmm1

README.md

@@ -76,7 +76,7 @@ The `AnalyticsQuery` object is used to describe what kind of data should be retr
 - `frequency` - Day, week or month.
 - `measures` - metrics to be fetched.
 
-Metrics are specified under `measures` key in query options. They can also be an array `metrics: [itc.measures.units, itc.measures.sales]`.
+Metrics are specified under `measures` key in query options. They can also be an array `measures: [itc.measures.units, itc.measures.sales]`.
 
 Available metris: