version 1.38.1

Changes

• [bolt] #1281 #1279 Fail to run event listeners for app_mention events with bot_message subtype - Thanks @seratch
• [kotlin extensions] #1278 #1277 Kotlin extension should be populated with an earlier api target - Thanks @rocketraman
• [slack-api-client] #1275 Make the same change to chat.postMessage with #1274 - Thanks @seratch
• [slack-api-client] Many property addition to Web API response types - Thanks @seratch

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/94?closed=1
• All changes: v1.38.0...v1.38.1