Upgrade AWS SDK to the latest version

vendor/github.com/aws/aws-sdk-go/example/service/dynamodb/unitTest/README.md

@@ -6,6 +6,7 @@ methods connecting to DynamoDB, or as `unitTest` demonstrates, create your own
 ## Test-compatible DynamoDB field
 If you use `*dynamodb.DynamoDB` as a field, you will be unable to unit test it,
 as documented in #88. Cast it instead as `dynamodbiface.DynamoDBAPI`:
+
 ```go
 type ItemGetter struct {
 		DynamoDB dynamodbiface.DynamoDBAPI
@@ -14,6 +15,7 @@ type ItemGetter struct {
 
 ## Querying actual DynamoDB
 You'll need an `*aws.Config` and `*session.Session` for these to work correctly:
+
 ```go
 // Setup
 var getter = new(ItemGetter)
@@ -30,6 +32,7 @@ Construct a `fakeDynamoDB` and add the necessary methods for each of those
 structs (custom ones for `ItemGetter` and [whatever methods you're using for
 DynamoDB](https://github.com/aws/aws-sdk-go/blob/master/service/dynamodb/dynamodbiface/interface.go)),
 and you're good to go!
+
 ```go
 type fakeDynamoDB struct {
 		dynamodbiface.DynamoDBAPI
@@ -42,7 +45,7 @@ getter.DynamoDB.GetItem(/* ... */)
 
 ## Output
 ```
-$ go test -cover
+$ go test -tags example -cover
 PASS
 coverage: 100.0% of statements
 ok		_/Users/shatil/workspace/aws-sdk-go/example/service/dynamodb/unitTest	0.008s