Updating README.md and CONTRIBUTING.md

Author: vijayabraj

CONTRIBUTING.md

@@ -4,4 +4,6 @@ Before you submit a pull request, we ask that you consider the following:
 
 - Submit an issue to state the problem your pull request solves or the funtionality that it adds. We can then advise on the feasability of the pull request, and let you know if there are other possible solutions.
 - Part of the SDK is auto-generated based on the XML schema. Due to this auto-generation, we cannot merge contributions for request or response classes. You are welcome to open an issue to report problems or suggest improvements. Auto-generated classes include all files inside [contract/v1](https://github.com/AuthorizeNet/sdk-java/tree/master/src/main/java/net/authorize/api/contract/v1)  and [controller](https://github.com/AuthorizeNet/sdk-java/tree/master/src/main/java/net/authorize/api/controller) folders, except [controller/base](https://github.com/AuthorizeNet/sdk-java/tree/master/src/main/java/net/authorize/api/controller/base).
-- Files marked as deprecated are no longer supported. Issues and pull requests for changes to these deprecated files will be closed.
+- Files marked as deprecated are no longer supported. Issues and pull requests for changes to these deprecated files will be closed.
+- Recent changes will be in future branch. Check the code in *future* branch first to see if a fix has already been merged, before suggesting changes to a file.
+- **Always create pull request to the future branch.** The pull request will be merged to future, and later pushed to master as part of the next release. 

README.md

@@ -27,7 +27,7 @@ _Note: Support for building the SDK with either Ant or Maven has been made. Plea
 Since August 2018, the Authorize.Net API has been reorganized to be more merchant focused. AuthorizeNet AIM, ARB, CIM, Transaction Reporting and SIM classes have all been deprecated in favor of `net\authorize\api` . To see the full list of mapping of new features corresponding to the deprecated features, you can see [MIGRATING.md](MIGRATING.md).
 
 ### Contribution
- - If need information or clarification about any Authorize.Net features, please create an issue for it. Also you can search for it in the [Authorize.Net developer community](https://community.developer.authorize.net/).
+ - If you need information or clarification about any Authorize.Net features, please create an issue for it. Also you can search in the [Authorize.Net developer community](https://community.developer.authorize.net/).
  - Before creating pull requests, please read [CONTRIBUTING.md](CONTRIBUTING.md)
 
 ### TLS 1.2