Merge pull request #6 from LexMachinaInc/docs-update-readme

removes outdated refrence to sandbox

Author: JesseGCarver

README.md

@@ -10,7 +10,7 @@ This package provides a client to access the Lex Machina API for legal analytics
 3. Install package with `pip3 install lexmachina-client` .
 1. Create an app and get the client key and secret via the [directions here](https://developer.lexmachina.com/default/docs/generating_oauth_credentials).
 
-1. In your project directory create a directory `config` and inside that create a file named config.ini . Populate using the below values and the key and secret from above. The below values for URLS should be used if you are using Lex Machina's production API. If you are testing this out with the [sandbox API](https://developer.lexmachina.com/default/documentation/lexmachina-sandbox) then you should use `base_url = https://api.sandbox.lexmachina.com`
+1. In your project directory create a directory `config` and inside that create a file named config.ini . Populate using the below values and the key and secret from above. The below values for URLS should be used if you are using Lex Machina's production API.
 
     ```
     [URLS]