Update README.md

Author: Sillson

README.md

@@ -18,6 +18,9 @@ Or install it yourself as:
 
     $ gem install query_bigly
 
+It's prudent to note that since the `QueryBigly` defaults are dependent upon environment variables, these will need to be available to the gem upon instantiation. For troubleshooting, please see the following regarding [Dotenv load order](https://github.com/bkeepers/dotenv#installation)
+
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 ## Usage
 
 ### Do These Things First