Update vendor (#1461)

* Update vendored libs

* Fix slack api changes

vendor/github.com/labstack/echo/v4/bind.go

@@ -134,6 +134,10 @@ func (b *DefaultBinder) bindData(destination interface{}, data map[string][]stri
 
 	// !struct
 	if typ.Kind() != reflect.Struct {
+		if tag == "param" || tag == "query" {
+			// incompatible type, data is probably to be found in the body
+			return nil
+		}
 		return errors.New("binding element must be a struct")
 	}