version 1.21.0

Changes

• [slack-api-client] #957 Fix #954 Add setToken(String) to MethodsClient request Interface - Thanks @seratch
• [slack-api-client] #958 Add domain to team.info API parameters - Thanks @seratch
• [slack-api-client] #956 Fix #955 Add more Javadocs to slack-api-method classes and interfaces - Thanks @seratch
• [all] #959 Upgrade optional dependency patch/minor versions - Thanks @seratch

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• All issues/pull requests: https://github.com/slackapi/java-slack-sdk/milestone/52?closed=1
• All changes: v1.20.2...v1.21.0