Update kekeybase/go-keybase-chat-bot vendor

vendor/github.com/keybase/go-keybase-chat-bot/kbchat/errors.go

@@ -0,0 +1,36 @@
+package kbchat
+
+import "fmt"
+
+type ErrorCode int
+
+const (
+	RevisionErrorCode          ErrorCode = 2760
+	DeleteNonExistentErrorCode ErrorCode = 2762
+)
+
+// Error is for unmarshaling CLI json responses
+type Error struct {
+	Code    ErrorCode `json:"code"`
+	Message string    `json:"message"`
+}
+
+func (e Error) Error() string {
+	return fmt.Sprintf("received error response from keybase api: %s", e.Message)
+}
+
+type APIError struct {
+	err error
+}
+
+func (e APIError) Error() string {
+	return fmt.Sprintf("failed to call keybase api: %v", e.err)
+}
+
+type UnmarshalError struct {
+	err error
+}
+
+func (e UnmarshalError) Error() string {
+	return fmt.Sprintf("failed to parse output from keybase api: %v", e.err)
+}