version 1.1.5

Changes

• #194 Fix #193 by enabling listener middleware to return a response - Thanks @Ambro17 @seratch
• #189 Add type hint updates missed in #148 - Thanks @seratch
• Upgrade slack_sdk to v3.1.1 - Thanks @seratch

References

• milestone: https://github.com/slackapi/bolt-python/milestone/19?closed=1
• diff: v1.1.4...v1.1.5