Update README.md

README.md

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 The easiest way to explain Filby is that it's like source control for reference data. 
 
 - In systems like git, you have a **commit log**, comprising a sequence of **commits**. Each commit is uniquely identified by a **commit hash**, and typically bundles related **source code** changes. <br/><br/>
-- With Filby, you have a **change log**, comprising a sequence of **change sets**. Each change set is uniquely identified by a **change id**, and typically bundles related reference data changes.
+- With Filby, you have a **change log**, comprising a sequence of **change sets**. Each change set is uniquely identified by a **change id**, and typically bundles related **reference data** changes.
 
 Like checking out a commit, your applications can use the Filby API to retrieve a desired set of reference data for a given change set id. They can also inspect the changelog to find which change set was in effect at a given point in time, and be notified when the reference data they are interested in changes.