Add lex response (#197)

* Add missed LexResponse to events

* Update README for events

Author: ezhdan-nyt

events/README.md

@@ -32,6 +32,8 @@ This package provides input types for Lambda functions that process AWS events.
 
 [Kinesis Firehose Events](README_KinesisFirehose.md)
 
+[Lex Events](README_Lex.md)
+
 [S3 Events](README_S3.md)
 
 [SES Events](README_SES.md)

events/lex.go

@@ -5,7 +5,7 @@ type LexEvent struct {
 	InvocationSource  string            `json:"invocationSource,omitempty"`
 	UserID            string            `json:"userId,omitempty"`
 	InputTranscript   string            `json:"inputTranscript,omitempty"`
-	SessionAttributes map[string]string `json:"sessionAttributes,omitempty"`
+	SessionAttributes SessionAttributes `json:"sessionAttributes,omitempty"`
 	RequestAttributes map[string]string `json:"requestAttributes,omitempty"`
 	Bot               *LexBot           `json:"bot,omitempty"`
 	OutputDialogMode  string            `json:"outputDialogMode,omitempty"`
@@ -41,8 +41,15 @@ type LexDialogAction struct {
 	ResponseCard     *LexResponseCard  `json:"responseCard,omitempty"`
 }
 
+type SessionAttributes map[string]string
+
 type Slots map[string]*string
 
+type LexResponse struct {
+	SessionAttributes SessionAttributes `json:"sessionAttributes,omitempty"`
+	DialogAction      *LexDialogAction  `json:"dialogAction,omitempty"`
+}
+
 type LexResponseCard struct {
 	Version            int64        `json:"version,omitempty"`
 	ContentType        string       `json:"contentType,omitempty"`