role updates

- bolt will now ensure role is present before exec payload
- readme updates
- removed author struct since roles are checked in bolt framework

command.go

@@ -16,15 +16,9 @@ type Payload func(msg Message) (res string, err error)
 
 // contains the basic information needed for a message command
 type Message struct {
-	Author  Author
+	Author  string   //username of message author
 	Words   []string //words from message split on whitespace
 	Message string   //entire message content
 	Channel string   //channel message was sent in
 	Server  string   //guild message was sent in
 }
-
-// username and roles of message authors
-type Author struct {
-	Username string
-	Roles    []string
-}