Unable to determine Swift versio

[!] Unable to determine Swift version for the following pods: - `speech_to_text` does not specify a Swift version and none of the targets (`Runner`) integrating it have the `SWIFT_VERSION` attribute set. Please contact the author or set the `SWIFT_VERSION` attribute in at least one of the targets that integrate this pod.

解决方案：在podfile文件中添加 环境变量`SWIFT_VERSION`

ENV['SWIFT_VERSION'] = '5'