update readme

cdimascio · Dec 3, 2017 · 7158e18 · 7158e18
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@@ -5,6 +5,7 @@ Dotenv is a zero-dependency module that loads environment variables from a `.env
 
 **Note:** Java does not provide a way to set environment variables on a currently running process. Thus, once `java-dotenv` is configured, you can use the `dotenv.get("...")` API to get environment variables, instead of `System.getenv(...)`.
 
+`dotenv` should be used to retrieve all environment variables. Those listed in `.env` will override those in the the environment. 
 ## Install
 
 ### Maven