Update vendored deps, including AWS SDK, openpgp, ftp, ...

vendor/github.com/aws/aws-sdk-go/models/apis/polly/2016-06-10/api-2.json

@@ -5,6 +5,7 @@
     "endpointPrefix":"polly",
     "protocol":"rest-json",
     "serviceFullName":"Amazon Polly",
+    "serviceId":"Polly",
     "signatureVersion":"v4",
     "uid":"polly-2016-06-10"
   },
@@ -224,6 +225,7 @@
         "fr-FR",
         "is-IS",
         "it-IT",
+        "ko-KR",
         "ja-JP",
         "nb-NO",
         "nl-NL",
@@ -498,6 +500,7 @@
         "Justin",
         "Kendra",
         "Kimberly",
+        "Matthew",
         "Salli",
         "Conchita",
         "Enrique",
@@ -527,7 +530,10 @@
         "Tatyana",
         "Astrid",
         "Filiz",
-        "Vicki"
+        "Vicki",
+        "Takumi",
+        "Seoyeon",
+        "Aditi"
       ]
     },
     "VoiceList":{