version 1.40.0

Changes

• [slack-api-client] #1323 Add canvas APIs and users.discoverableContacts.lookup API - Thanks @filmaj @seratch
• [all] #1319 Add deprecation warnings to Steps from Apps components - Thanks @seratch
• [slack-api-client] Add new properties to Web API responses - Thanks @seratch
• [documents] Mark "Steps from Apps" as deprecated - Thanks @seratch

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/99?closed=1
• All changes: v1.39.3...v1.40.0