Merge pull request slack-go#868 from sryoya/remove_user_parameter_fro…

…m_-SetUserRealName

Remove the unnecessary parameter from SetUserRealName and update optional param handling in profile setting

Merge pull request slack-go#854 from slack-go/fix-851

Fix unintended json marshalling error

Merge pull request slack-go#725 from BattleBas/verifyuniqueblockid

Add check in OpenView to verify that BlockID is unique for InputBlock's