Update README.md

Author: brianmc

README.md

@@ -20,7 +20,7 @@ Use of this SDK and the CyberSource APIs requires having an account on our syste
 
 Once you have your keys, simply load them into the appropriate variables in your code, as per the below sample code dealing with the authentication part of the API request. 
 
-Remember this SDK is for use in server-side Node applications that access the CyberSource REST API and credentials should always be securely store and accessed appropriately. 
+Remember this SDK is for use in server-side Node applications that access the CyberSource REST API and credentials should always be securely stored and accessed appropriately. 
 
 
 ## SDK Usage Examples and Sample Code