docs: README update with sessionToken and any other config supported

Author: Scale93

README.md

@@ -67,6 +67,8 @@ Put options under `custom.appsync-simulator` in your `serverless.yml` file
 | dynamoDb.region          | localhost                  | Dynamodb region. Specify it if you're connecting to a remote Dynamodb intance.                                                                                      |
 | dynamoDb.accessKeyId     | DEFAULT_ACCESS_KEY         | AWS Access Key ID to access DynamoDB                                                                                                                                |
 | dynamoDb.secretAccessKey | DEFAULT_SECRET             | AWS Secret Key to access DynamoDB                                                                                                                                   |
+| dynamoDb.sessionToken    | DEFAULT_ACCESS_TOKEEN      | AWS Session Token to access DynamoDB, only if you have  temporary security credentials configured on AWS                                                            |
+| dynamoDb.*               |                            | You can add every configuration accepted by DynamoDB                                                                                                                |
 | watch                    | - \*.graphql<br/> - \*.vtl | Array of glob patterns to watch for hot-reloading.                                                                                                                  |
 
 Example:

src/getAppSyncConfig.js

@@ -54,22 +54,10 @@ export default function getAppSyncConfig(context, appSyncConfig) {
 
     switch (source.type) {
       case 'AMAZON_DYNAMODB': {
-        const {
-          endpoint,
-          region,
-          accessKeyId,
-          secretAccessKey,
-          sessionToken,
-        } = context.options.dynamoDb;
-
         return {
           ...dataSource,
           config: {
-            endpoint,
-            region,
-            accessKeyId,
-            secretAccessKey,
-            sessionToken,
+            ...context.options.dynamoDb,
             tableName: source.config.tableName,
           },
         };