Update Readme for Application Identity from Development-> Master (#128)

* Update README.md

* Update package.json

Author: gtaban

README.md

@@ -244,19 +244,19 @@ To utilize the custom identity flow, the user must first register a public key i
 Refer to the [documentation on custom identity](https://console.bluemix.net/docs/services/appid/custom.html#custom-identity) for more details on how to implement App ID's custom identity flow in your application.
 
 
-### Application Identity
+### Application Identity and Authorization
 
-In case you want to invoke protected/secure APIs from applications or clients that are non user interactive, you can use the App ID app to app flow to authenticate and authorize your non user interactive applications.  
+In case you want to call protected APIs from applications or clients that are non-interactive (i.e., there is no user involved), you can use the App ID application identity and authorization flow to secure your applications.   
 
-App ID app to app flow implements the OAuth2.0 Client Credentials grant.
+App ID application authorization implements the OAuth2.0 Client Credentials grant.
 
-Before you can obtain access tokens for the app to app flow, you need to obtain a `client ID` and a `secret` by registering your application with your App ID instance. Refer to the [App ID app to app documentation](https://console.bluemix.net/docs/services/appid/app-to-app.html#registering) on how to register your applications.
+Before you can obtain access tokens using the application authorization flow, you need to obtain a `client ID` and a `secret` by registering your application with your App ID instance. Refer to the [App ID application identity and authorization documentation](https://console.bluemix.net/docs/services/appid/app-to-app.html#registering) on how to register your applications.
 
-Since the application needs to store the `client ID` and the `secret`, the app to app flow must never be used with untrusted clients such as mobile clients and browser based applications.
+Since the application needs to store the `client ID` and the `secret`, this flow must never be used with untrusted clients such as mobile clients and browser based applications.
 
-Also, note that this flow only returns an access token and no identity or refresh tokens are issued in this flow.
+Also, note that this flow only returns an access token and no identity or refresh tokens are issued.
 
-The code snippet below describes how to obtain the access tokens for the app to app flow.
+The code snippet below describes how to obtain the access token for this flow.
 
 ```javascript
 const config = {
@@ -280,7 +280,7 @@ async function getAppIdentityToken() {
 	}
 }
 ```
-For more detailed information on using app to app flow, refer to the [App ID documentation](https://console.bluemix.net/docs/services/appid/app-to-app.html#app).
+For more detailed information on using the application identity and authorization flow, refer to the [App ID documentation](https://console.bluemix.net/docs/services/appid/app-to-app.html#app).
 
 ### Manage User Profile
 Using the App ID UserProfileManager, you are able to create, delete, and retrieve user profile attributes as well as get additional info about a user.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ibmcloud-appid",
-  "version": "4.2.0",
+  "version": "4.2.1",
   "description": "Node.js SDK for the IBM Cloud App ID service",
   "main": "lib/appid-sdk.js",
   "scripts": {